Patent Publication Number: US-11640238-B2

Title: Portable device comprising a touch-screen display, and method for controlling same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This is a continuation of U.S. application Ser. No. 17/107,353 filed on Nov. 30, 2020, now U.S. Pat. No. 11,237,723 issued on Aug. 17, 2021, which is a continuation of U.S. application Ser. No. 16/834,705 filed on Mar. 30, 2020, now U.S. Pat. No. 10,852,942 issued on Dec. 1, 2020, which is a continuation of U.S. application Ser. No. 16/741,377 filed on Jan. 13, 2020, now U.S. Pat. No. 10,642,485 issued on May 5, 2020, which is a continuation of U.S. application Ser. No. 16/414,476 filed on May 16, 2019, now U.S. Pat. No. 10,534,531 issued on Jan. 14, 2020, which is a continuation of U.S. application Ser. No. 15/344,665 filed on Nov. 7, 2016, now U.S. Pat. No. 10,459,625 issued on Oct. 29, 2019, which is a continuation of U.S. application Ser. No. 14/790,496 filed Jul. 2, 2015, now U.S. Pat. No. 9,489,079 issued on Nov. 8, 2016, which is a continuation of U.S. application Ser. No. 13/984,805 filed on Aug. 9, 2013, now U.S. Pat. No. 9,489,078 issued on Nov. 8, 2016, which is a National Stage Application of International Application No. PCT/KR2012/000888, filed on Feb. 7, 2012, and which claims priority from U.S. Provisional Application No. 61/441,491, filed on Feb. 10, 2011, the disclosures of which are herein incorporated by reference in their entireties. 
    
    
     BACKGROUND 
     Field 
     Methods and apparatuses consistent with exemplary embodiments relate to a portable device, and more particularly, to a portable device displaying a plurality of task screens through a touch screen display and executing an application according to a touch gesture of a user detected on the plurality of task screens, and a method of controlling the same. 
     Description of Related Art 
     An electronic device directly controlled by a user includes at least one display device, and the user controls the electronic device through an input device while viewing an operation of an application executed on the display device of the electronic device. Particularly, a portable electronic device (hereinafter, referred to as a portable device) manufactured to be carried by the user is developed to include a display device using a user interface in a form of a touch screen due to a limited size thereof in many cases. 
     A Graphical User Interface (GUI) used in a touch screen display should provide an optimized form to allow the user to intuitively recognize an operation of a running application and also allow the user to more easily, quickly, and variously control the portable device and the running application. Accordingly, various user interfaces have been developed according to forms of the applied application or display device. 
     Particularly, as a Central Processor Unit (CPU) and a software technology are developed, the portable device can provide a plurality of task screens displaying one or a plurality of applications. The plurality of task screens may be provided through one or more touch screens which are physically or graphically divided. Accordingly, the portable device providing the plurality of task screens requires a graphic user interface for a touch screen which can allow the user to more intuitively and conveniently use the portable device. 
     Further, a more advanced portable device can detect a touch gesture, a motion or a pose of the portable device, and a motion or a shape of the user as an input, as well as an input of a hard or soft key. Accordingly, a user interface for allowing the user to more conveniently use the portable device through various inputs is also required. 
     SUMMARY 
     One or more exemplary embodiments provide a portable device including a touch screen display and a control method thereof. 
     One or more exemplary embodiments also provide a portable device including a plurality of touch screen displays providing a plurality of task screens by one or a plurality of applications, and a control method thereof. 
     One or more exemplary embodiments also provide a portable device which detects a touch gesture of a user from a plurality of connected touch screen displays and displays information in response to the detection, and a control method thereof. 
     One or more exemplary embodiments also provide a portable device which provides an optimized user interface corresponding to a portrait view mode or a landscape view mode to at least one touch screen display, and a control method thereof. 
     One or more exemplary embodiments also provide a portable device which provides a plurality of task screens for a plurality of applications or one application to at least one touch screen display, and a control method thereof. 
     One or more exemplary embodiments also provide a portable device which displays some information on a plurality of applications to be partially hidden in a form of received cards, and expands more detailed information on a corresponding application according to a touch motion of the user and displays the expanded information, and a control method thereof. 
     One or more exemplary embodiments also provide a portable device which displays maps according to a map application in a first touch screen display and displays at least one image corresponding to a position or path selected by a touch gesture of the user on the maps in a second touch screen display, and a control method thereof. 
     One or more exemplary embodiments also provide a portable device which displays a task management area listing a shortcut icon of at least one application in a designated position and displays an application selected by a touch gesture of the user in one of a plurality of touch screen displays, and a control method thereof. 
     One or more exemplary embodiments also provide a portable device which displays positions of a plurality of personal broadcasters in a map of a first touch screen display, lists and displays simple information on the personal broadcasters in a second touch screen display, and makes a request for broadcasting to a desired personal broadcaster in response to a touch gesture of the user, and a control method thereof. 
     One or more exemplary embodiments also provide a portable device which displays a clipboard in a designated position in response to folding of dual displays connected by a hinge or bending of a flexible display, and a control method thereof. 
     One or more exemplary embodiments also provide a portable device which sets a bookmark of an e-book displayed in a display, or moves pages and then displays the e-book in response to folding of dual displays connected by a hinge or bending of a flexible display, and a control method thereof. 
     One or more exemplary embodiments also provide a portable device which provides a video for a video conference to a first touch screen display and displays a document file or a white board shared by participants of the video conference in a second touch screen display, and a control method thereof. 
     One or more exemplary embodiments also provide a portable device which provides a game interface for a first user to a first touch screen display and displays game information for another user in a second touch screen display, and a control method thereof. 
     One or more exemplary embodiments also provide a portable device which provides a user interface for a calendar application through a dual touch screen display, and a control method thereof. 
     One or more exemplary embodiments also provide a portable device which provides a user interface for a call application through a dual touch screen display, and a control method thereof. 
     One or more exemplary embodiments also provide a portable device which provides a user interface for a camera application through a dual touch screen display, and a control method thereof. 
     One or more exemplary embodiments also provide a portable device which controls a view mode through a motion of the portable device in a dual touch screen display, and a control method thereof. 
     One or more exemplary embodiments also provide a portable device for navigating information displayed in two touch screens of a dual touch screen display, and a control method thereof. 
     One or more exemplary embodiments also provide a portable device for modifying a home screen by using lists displayed in a sub touch screen in a dual touch screen display, and a control method thereof. 
     One or more exemplary embodiments also provide a portable device for displaying a virtual keypad by using a touch screen located in a lower part in a landscape view mode of a dual touch screen display, and a control method thereof. 
     In accordance with an aspect of an exemplary embodiment, there is provided a method of controlling a portable device including at least one foldable panel and first and second touch screens arranged on the at least one foldable panel, the method including displaying, on the first touch screen, a first page including at least one of a widget area designated as a home screen and an icon related to at least one application, and a dock area including a call icon of a call application, displaying, on the second touch screen, first information in a state where a first panel of the at least one foldable panel includes the first touch screen, a second panel of the at least one foldable panel includes the second touch screen, and the first panel and second panel are unfolded, detecting a first tap gesture that selects the call icon. The method also includes, in response to a detection of the first tap gesture, replacing the first page and the dock area displayed on the first touch screen with an outgoing call screen provided by the call application by displaying the outgoing call screen on the first touch screen, wherein the outgoing call screen includes at least one of a number display area, a keypad area, a call key, a video call key, and a message sending key, and the second touch screen maintains the first information while the outgoing call screen is displayed on the first touch screen, receiving a phone number input through the keypad area and detecting a second tap gesture from the call key, replacing the outgoing call screen displayed on the first touch screen with a dialing screen by displaying the dialing screen on the first touch screen in response to a detection of the second tap gesture, and displaying, on the second touch screen, a guide message screen indicating to fold the portable device for a call, wherein the dialing screen includes a call participant identification area indicating a counterpart call participant and a function key area providing mid-call functions, replacing the dialing screen displayed on the first touch screen with a mid-call screen by displaying the mid-call screen on the first touch screen in response to the call being connected with the counterpart call participant, and removing the guide message screen displayed on the second touch screen, and displaying the first information, wherein the mid-call screen includes a call participant identification area indicating the counterpart call participant and a function key area providing a call duration time and mid-call functions. 
     In accordance with an aspect of another exemplary embodiment, there is provided a method of controlling a portable device including a first touch screen and a second touch screen, the method including, displaying first information on the first touch screen and detecting an outgoing call request while second information is displayed on the second touch screen, replacing the first information displayed on the first touch screen with an outgoing call screen by displaying the outgoing call screen in response to the detecting the outgoing call request, wherein the outgoing call screen includes at least one of a number display area displaying a dialed number, a call key, a video call key, and a message sending key, and the second touch screen maintains the second information while the outgoing call screen is displayed on the first touch screen, receiving a phone number input through the keypad area and detecting a first tap gesture from the call key, replacing the outgoing call screen displayed on the first touch screen with a dialing screen by displaying the dialing screen in response to the detecting the first tap gesture, wherein the dialing screen includes a call participant identification area indicating a counterpart call participant corresponding to the input phone number and a function key area providing mid-call functions. The method also includes deactivating the second information displayed on the second touch screen and displaying, on the second touch screen, a guide message indicating to fold the portable device for the call while the outgoing call screen is displayed, replacing the dialing screen on the first touch screen with a mid-call screen by displaying the mid-call screen in response to the call being connected with the counterpart call participant, and removing the guide message displayed on the second touch screen, and displaying the first information, wherein the mid-call screen includes a call participant identification area indicating the counterpart call participant and a function key area providing a call duration time and mid-call functions. 
     In accordance with an aspect of another exemplary embodiment, a portable device including at least one foldable panel, a first touch screen and a second touch screen arranged on the at least one foldable panel, and at least one processor that is configured to: display, on the first touch screen, a first page including at least one of a widget area designated as a home screen and an icon related to at least one application, and a dock area including a call icon of a call application, display, on the second touch screen, first information in a state where a first panel of the at least one foldable panel includes the first touch screen, a second panel of the at least one foldable panel includes the second touch screen, and the first panel and second panel are unfolded, detect a first tap gesture that selects the call icon, and replace the first page and the dock area displayed on the first touch screen with an outgoing call screen provided by the call application by displaying the outgoing call screen on the first touch screen in response to a detection of the first tap gesture, wherein the outgoing call screen includes at least one of a number display area, a keypad area, a call key, a video call key, and a message sending key, and the second touch screen maintains the first information while the outgoing call screen is displayed in the first touch screen. The processor is also configured to receive a phone number input through the keypad area and detect a second tap gesture from the call key, replace the outgoing call screen displayed on the first touch screen with a dialing screen by displaying the dialing screen on the first touch screen in response to the detection of the second tap gesture, and display, on the second touch screen, a guide message indicating to fold the portable device for a call, wherein the dialing screen includes a call participant identification area indicating a counterpart call participant and a function key area providing mid-call functions, replace the dialing screen displayed on the first touch screen with a mid-call screen by displaying the mid-call screen on the first touch screen in response to the call being connected with the counterpart call participant, and remove the guide message displayed on the second touch screen, and display the first information, wherein the mid-call screen includes a call participant identification area indicating the counterpart call participant and a function key area providing a call duration time and mid-call functions. 
     In accordance with an aspect of another exemplary embodiment, there is provided a portable device including a first touch screen and a second touch screen, and at least one processor that is configured to display first information on the first touch screen and detect an outgoing call request while second information is displayed on the second touch screen, replace the first information displayed on the first touch screen with an outgoing call screen by displaying the outgoing call screen on the first touch screen in response to the detection of the outgoing call request, wherein the outgoing call screen includes at least one of a number display area displaying a dialed number, a call key, a video call key, and a message sending key, and the second touch screen maintains the second information while the outgoing call screen is displayed on the first touch screen, receive a phone number input through the keypad area and detect a first tap gesture from the call key, and replace the outgoing call screen displayed on the first touch screen with a dialing screen by displaying the dialing screen on the first touch screen in response to the detection of the first tap gesture, and display, on the second touch screen, a guide message indicating to fold the portable device for a call, wherein the dialing screen includes a call participant identification area indicating a counterpart call participant corresponding to the input phone number and a function key area providing mid-call functions. The processor is also configured to replace the dialing screen displayed on the first touch screen with a mid-call screen by displaying the mid-call screen on the first touch screen in response to the call being connected with the counterpart call participant, and remove the guide message on the second touch screen, and displaying the first information, wherein the mid-call screen includes a call participant identification area indicating the counterpart call participant and a function key area providing a call duration time and mid-call functions. 
     In accordance with an aspect of another exemplary embodiment, there is provided a non-transitory computer-readable medium storing a program executable by a computer to perform a method of controlling a portable device including at least one foldable panel and first and second touch screens arranged on the at least one foldable panel, the method including, displaying, on the first touch screen, a first page including at least one of a widget area designated as a home screen and an icon related to at least one application, and a dock area including a call icon of a call application, displaying, on the second touch screen, first information in a state where a first panel of the at least one foldable panel includes the first touch screen, a second panel of the at least one foldable panel includes the second touch screen, and the first panel and second panel are unfolded, detecting a first tap gesture that selects the call icon, and replacing the first page and the dock area displayed on the first touch screen with an outgoing call screen provided by the call application by displaying the outgoing call screen on the first touch screen in response to the detecting the first tap gesture, wherein the outgoing call screen includes at least one of a number display area, a keypad area, a call key, a video call key, and a message sending key, and the second touch screen maintains the first information while the outgoing call screen is displayed in the first touch screen. The method also includes receiving a phone number input through the keypad area and detecting a second tap gesture from the call key, replacing the outgoing call screen displayed on the first touch screen with a dialing screen by displaying the dialing screen on the first touch screen in response to the detecting the second tap gesture, and displaying, on the second touch screen, a guide message indicating to fold the portable device for a call, wherein the dialing screen includes a call participant identification area indicating a counterpart call participant and a function key area providing mid-call functions, replacing the dialing screen displayed on the first touch screen with a mid-call screen by displaying the mid-call screen on the first touch screen in response to the call being connected with the counterpart call participant, and removing the guide message displayed on the second touch screen, and displaying the first information, wherein the mid-call screen includes a call participant identification area indicating the counterpart call participant and a function key area providing a call duration time and mid-call functions. 
     In accordance with an aspect of another exemplary embodiment, there is provided a non-transitory computer-readable medium storing a program executable by a computerto perform a method of controlling a portable device including a first touch screen and a second touch screen, the method including, displaying first information on the first touch screen and detecting an outgoing call request while second information is displayed on the second touch screen, replacing the first information displayed on the first touch screen with an outgoing call screen by displaying the outgoing call screen in response to the detecting the outgoing call request, wherein the outgoing call screen includes at least one of a number display area displaying a dialed number, a call key, a video call key, and a message sending key, and the second touch screen maintains the second information while the outgoing call screen is displayed on the first touch screen, receiving a phone number through the keypad area and detecting a first tap gesture from the call key, replacing the outgoing call screen displayed on the first touch screen with a dialing screen by displaying the dialing screen on the first touch screen in response to the detecting the first tap gesture, and display, on the second touch screen, a guide message indicating to fold the portable device for a call, wherein the dialing screen includes a call participant identification area indicating a counterpart call participant corresponding to the input phone number and a function key area providing mid-call functions, replacing the dialing screen displayed on the first touch screen with a mid-call screen by displaying the mid-call screen on the first touch screen in response to the call being connected with the counterpart call participant, and removing the guide message displayed on the second touch screen, and displaying the first information, wherein the mid-call screen includes a call participant identification area indicating the counterpart call participant and a function key area providing a call duration time and mid-call functions. 
     In accordance with an aspect of another exemplary embodiment, there is provided a method of controlling a portable device including a first touch screen and a second touch screen arranged on at least one foldable panel, the method including, displaying first information on the first touch screen and detecting a generation of a first incoming call while second information is displayed on the second touch screen in a state where a first panel of the at least one foldable panel includes the first touch screen and a second panel of the at least one foldable panel includes the second touch screen are unfolded, replacing the first information displayed on the first touch screen with a first incoming call screen related to the first incoming call provided by a call application by displaying the first incoming call screen on the first touch screen in response to the generation of the first incoming call, wherein the first incoming call screen includes at least one of a call participant identification area indicating a counterpart call participant, an incoming key, and a rejection message key, deactivating the second information displayed on the second touch screen and displaying a guide message indicating to fold the portable device for a call while displaying the first incoming call screen, detecting a pre-designated first touch gesture from the incoming key within the first incoming call screen, replacing the incoming call screen displayed on the first touch screen with a mid-call screen by displaying the mid-call screen on the first touch screen in response to the detecting the first touch gesture, and removing the guide message displayed the second touch screen, wherein the mid-call screen includes a call participant identification area indicating the counterpart call participant and a function key area providing a call duration time and mid-call functions, and replacing the mid-call screen displayed on the first touch screen with the first information by displaying the first information on the first touch screen in response to the first incoming call ending. 
     In accordance with an aspect of another exemplary embodiment, there is provided a method of controlling a portable device including a first touch screen and a second touch screen, the method including, detecting a first incoming call while displaying first information on the first touch screen and displaying second information on the second touch screen, replacing the first information displayed on the first touch screen with a first incoming call screen related to the first incoming call by displaying the first incoming call screen on the first touch screen in response to the detecting the first incoming call, wherein the first incoming call screen includes at least one of a call participant identification area indicating a counterpart call participant corresponding to the first incoming call, an incoming key, and a rejection message key, deactivating the second information displayed on the second touch screen and displaying a guide message indicating to fold the portable device for a call while displaying the first incoming call screen, detecting a pre-designated first touch gesture from the incoming key within the first incoming call screen, and replacing the first incoming call screen displayed on the first touch screen with a mid-call screen by displaying the mid-call screen on the first touch screen in response to the detecting the first touch gesture, and removing the guide message displayed on the second touch screen, wherein the mid-call screen includes a call participant identification area indicating the counterpart call participant and a function key area providing a call duration time and mid-call functions. 
     In accordance with an aspect of another exemplary embodiment, there is provided a portable device including at least one foldable panel, a first touch screen and a second touch screen arranged on at least one foldable panel, and at least one processor that is configured to display, on the first touch screen, a first page including at least one of a widget area designated as a home screen and an icon related to at least one application and a dock area including a call icon of a call application, display, on the second touch screen, first information in a state where a first panel of the at least one foldable panel includes the first touch screen, a second panel of the at least one foldable panel includes the second touch screen, and the first and second panels are unfolded, detect a first tap gesture that selects the call icon, replace the first page and the dock area displayed on the first touch screen with an outgoing call screen provided by the call application by displaying the outgoing call screen on the first touch screen in response to a detection of the first tap gesture, wherein the outgoing call screen includes at least one of a number display area, a keypad area, a call key, a video call key, and a message sending key, and the second touch screen maintains the first information while the outgoing call screen is displayed in the first touch screen, receive a phone number through the keypad area and detect a second tap gesture from the call key, replace the outgoing call screen displayed on the first touch screen with a dialing screen by displaying the dialing screen on the first touch screen in response to the detection of the second tap gesture, and display, on the second touch screen, a guide message indicating to fold the portable device for a call, wherein the dialing screen includes a call participant identification area indicating a counterpart call participant and a function key area providing mid-call functions, replace the dialing screen displayed on the first touch screen with a mid-call screen by displaying the mid-call screen on the first touch screen in response to the call being connected with the counterpart call participant, and remove the guide message displayed on the second touch screen, and display the first information, wherein the mid-call screen includes a call participant identification area indicating the counterpart call participant and a function key area providing a call duration time and mid-call functions. 
     In accordance with an aspect of another exemplary embodiment, there is provided a portable device including at least one foldable panel, a first touch screen and a second touch screen arranged on the at least one foldable panel, and at least one processor that is configured to display, on the first touch screen, first information and detect a generation of a first incoming call while second information is displayed on the second touch screen in a state where a first panel of the at least one foldable panel includes the first touch screen, a second panel of the at least one foldable panel includes the second touch screen, and the first and second touch screens are unfolded, replace the first information displayed on the first touch screen with a first incoming call screen related to the first incoming call provided by a call application by displaying the first incoming call screen on the first touch screen in response to the generation of the first incoming call, wherein the first incoming call screen includes at least one of a call participant identification area indicating a counterpart call participant, an incoming key, and a rejection message key, deactivate the second information displayed on the second touch screen and display a guide message indicating to fold the portable device for a call while displaying the first incoming call screen, detect a pre-designated first touch gesture from the incoming key within the first incoming call screen, replace the incoming call screen displayed on the first touch screen with a mid-call screen by displaying the mid-call screen on the first touch screen in response to the detection of the first touch gesture, and remove the guide message screen on the second touch screen, wherein the mid-call screen includes a call participant identification area indicating the counterpart call participant and a function key area providing a call duration time and mid-call functions, and replace the mid-call screen on the first touch screen with the first information by displaying the first information on the first touch screen in response to the first incoming call ending. 
     In accordance with an aspect of another exemplary embodiment, there is provided a portable device including a first touch screen and a second touch screen, and at least one processor that is configured to detect a first incoming call while first information is displayed on the first touch screen and second information is displayed on the second touch screen, replace the first information displayed on the first touch screen with a first incoming call screen related to the first incoming call by displaying the first incoming call screen on the first touch screen in response to the detection of the first incoming call, wherein the first incoming call screen includes at least one of a call participant identification area indicating a counterpart call participant corresponding to the first incoming call, an incoming key, and a rejection message key, deactivate the second information on the second touch screen and display a guide message screen indicating to fold the portable device for a call while the first incoming call screen is displayed, detect a pre-designated first touch gesture from the incoming key within the first incoming call screen, and replace the first incoming call screen displayed on the first touch screen with a mid-call screen by displaying the mid-call screen on the first touch screen in response to the detection of the first touch gesture, and remove the guide message screen displayed on the second touch screen, wherein the mid-call screen includes a call participant identification area indicating the counterpart call participant and a function key area providing a call duration time and mid-call functions. 
     In accordance with an aspect of another exemplary embodiment, there is provided a non-transitory computer-readable medium storing a program executable by a computer to perform a method of controlling a portable device including a first touch screen and a second touch screen arranged on at least one foldable panel, the method including displaying, on the first touch screen, a first page including at least one of a widget area designated as a home screen and an icon related to at least one application or and displaying a dock area a call icon of a call application, displaying, on the second touch screen, first information in a state where a first panel of the at least one foldable panel includes the first touch screen, a second panel of the at least one foldable panel includes the second touch screen are unfolded, detecting a first tap gesture that selects the call icon, replacing the first page and the dock area on the first touch screen with an outgoing call screen provided by the call application by displaying the outgoing call screen on the first touch screen in response to a detection of the first tap gesture, wherein the outgoing call screen includes at least one of a number display area, a keypad area, a call key, a video call key, and a message sending key, and the second touch screen maintains the first information while the outgoing call screen is displayed in the first touch screen, receiving a phone number through the keypad area and detecting a second tap gesture from the call key, replacing the outgoing call screen displayed on the first touch screen with a dialing screen by displaying the dialing screen on the first touch screen in response to the detecting the second tap gesture, and displaying, on the second touch screen, a guide message indicating to fold the portable device for a call, wherein the dialing screen includes a call participant identification area indicating a counterpart call participant and a function key area providing mid-call functions, replacing the dialing screen displayed on the first touch screen with a mid-call screen by displaying the mid-call screen on the first touch screen in response to the call being connected with the counterpart call participant, and removing the guide message displayed on the second touch screen, and displaying the first information, wherein the mid-call screen includes a call participant identification area indicating the counterpart call participant and a function key area providing a call duration time and mid-call functions. 
     In accordance with an aspect of another exemplary embodiment, there is provided a non-transitory computer-readable medium storing a program executable by a computer to perform a method of controlling a portable device including a first touch screen and a second touch screen arranged on at least one foldable panel, the method including displaying first information on a first touch screen and detecting a generation of a first incoming call while second information is displayed on a second touch screen in a state where a first panel of the at least one foldable panel includes the first touch screen, a second panel of the at least one foldable panel includes the second touch screen, and the first and second panels are unfolded, replacing the first information displayed on the first touch screen with a first incoming call screen related to the first incoming call provided by a call application by displaying the first incoming call screen on the first touch screen in response to the generation of the first incoming call, wherein the first incoming call screen includes at least one of a call participant identification area indicating a counterpart call participant, an incoming key, and a rejection message key, deactivating the second information displayed on the second touch screen and displaying a guide message indicating to fold the portable device for a call while displaying the first incoming call screen, detecting a pre-designated first touch gesture from the incoming key within the first incoming call screen, replacing the incoming call screen displayed on the first touch screen with a mid-call screen by displaying the mid-call screen on the first touch screen in response to the detecting the first touch gesture, removing the guide message screen displayed on the second touch screen, wherein the mid-call screen includes a call participant identification area indicating the counterpart call participant and a function key area providing a call duration time and mid-call functions, and replacing the mid-call screen displayed on the first touch screen with the first information by displaying the first information on the first touch screen in response to the first incoming call ending. 
     In accordance with an aspect of another exemplary embodiment, there is provided a non-transitory computer-readable medium storing a program executable by a computer to perform a method of controlling a portable device including a first touch screen and a second touch screen arranged on at least one foldable panel, the method including detecting a first incoming call while displaying first information on the first touch screen and displaying second information on the second touch screen, replacing the first information displayed on the first touch screen with a first incoming call screen related to the first incoming call by displaying the first incoming call screen on the first touch screen in response to the detecting the first incoming call, wherein the first incoming call screen includes at least one of a call participant identification area indicating a counterpart call participant corresponding to the first incoming call, an incoming key, and a rejection message key, deactivating the second information displayed on the second touch screen and displaying a guide message indicating to fold the portable device for a call while displaying the first incoming call screen, detecting a pre-designated first touch gesture from the incoming key within the first incoming call screen, and replacing the first incoming call screen displayed on the first touch screen with a mid-call screen by displaying the mid-call screen on the first touch screen in response to the detecting the first touch gesture, and removing the guide message screen displayed on the second touch screen, wherein the mid-call screen includes a call participant identification area indicating the counterpart call participant and a function key area providing a call duration time and mid-call functions. 
     Other aspects and advantages of the invention will be apparent from the following description and the appended claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The foregoing and other aspects will become more apparent from the following detailed description of exemplary embodiments taken in conjunction with the accompanying drawings in which: 
         FIG.  1    is a block diagram illustrating a schematic configuration of a portable device according to an exemplary embodiment; 
         FIG.  2    is a perspective view of a portable device according to an exemplary embodiment; 
         FIGS.  3 A to  3 D  are diagrams illustrating screen modes according to a relative angle between a first panel and a second panel of a portable device according to one or more exemplary embodiments; 
         FIG.  4    is a perspective view of a portable device according to another exemplary embodiment; 
         FIGS.  5 A to  5 C  are perspective views of a portable device according to one or more exemplary embodiments; 
         FIGS.  6 A to  6 G  are diagrams illustrating a user interface of a home screen according to one or more exemplary embodiments; 
         FIGS.  7 A to  7 J  are diagrams illustrating a scenario of adding an icon of an application to a home screen displayed in first and second touch screens  12  and  14  according to one or more exemplary embodiments; 
         FIGS.  8 A to  8 C  are diagrams illustrating a user interface of an application menu according to one or more exemplary embodiments; 
         FIGS.  9 A to  9 J  are diagrams illustrating a change in a view mode according to a touch gesture according to one or more exemplary embodiments; 
         FIGS.  10 A to  10 H  are diagrams illustrating a user interface of a pocket mode home screen according to one or more exemplary embodiments; 
         FIGS.  11 A to  11 F  are diagrams illustrating a user interface of a pocket mode home screen according to one or more exemplary embodiments; 
         FIGS.  12 A to  121    are diagrams illustrating a user interface of a gallery map application according to one or more exemplary embodiments; 
         FIGS.  13 A to  13 J  are diagrams illustrating a user interface of a task manager panel according to one or more exemplary embodiments; 
         FIGS.  14 A to  14 M  are diagrams illustrating a user interface of a personal broadcasting application according to one or more exemplary embodiments; 
         FIGS.  15 A to  15 C  are diagrams describing a detection of a folding back command according to one or more exemplary embodiments; 
         FIGS.  16 A to  16 D  are diagrams describing a detection of a folding hold command according to one or more exemplary embodiments; 
         FIGS.  17 A to  17 K  are diagrams illustrating a user interface for a clipboard function according to one or more exemplary embodiments; 
         FIGS.  18 A to  18 P  are diagrams illustrating a user interface for an electronic book function according to one or more exemplary embodiments; 
         FIGS.  19 A to  19 G  are diagrams illustrating a user interface of a video conference application according to one or more exemplary embodiments; 
         FIGS.  20 A to  20 H  are a diagrams illustrating a user interface of a collaborative game application according to one or more exemplary embodiments; 
         FIGS.  21 A to  21 O  are diagrams illustrating a user interface of a schedule management application according to one or more exemplary embodiments; 
         FIGS.  22 A to  22 M  are diagrams illustrating scenarios of expanding a calendar area and displaying the expanded calendar area in a schedule management application according to one or more exemplary embodiments; 
         FIGS.  23 A to  23 P  are diagrams illustrating a user interface of a call application according to one or more exemplary embodiments; 
         FIGS.  24 A to  24 R  are diagrams illustrating a user interface of a call application according to one or more exemplary embodiments; 
         FIGS.  25 A to  25 L  and  FIGS.  26 A to  26 K  are diagrams illustrating a user interface of a camera application according to one or more exemplary embodiments; and 
         FIGS.  27 A to  27 Q  are diagrams illustrating a change in a view mode according to a physical motion of the portable device according to one or more exemplary embodiments. 
     
    
    
     DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS 
     Hereinafter, an operation principle of one or more exemplary embodiments will be described in detail with reference to the accompanying drawings. In the following description of one or more exemplary embodiments, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of one or more exemplary embodiments rather unclear. Further, terms described below are defined in consideration of the functions of one or more exemplary embodiments, and may have different meanings according to the intention of a user or operator or the convention. Therefore, its definition will be made based on the overall contents of this specification. 
     Throughout the drawings and the detailed description, unless otherwise described, the same drawing reference numerals will be understood to refer to the same elements, features, and structures. The relative size and depiction of these elements may be exaggerated for clarity, illustration, and convenience. 
     The term “ . . . unit” used in the embodiments indicates a component including software or hardware, such as a Field Programmable Gate Array (FPGA) or an Application-Specific Integrated Circuit (ASIC), and the “ . . . unit” performs certain roles. However, the “ . . . unit” is not limited to software or hardware. The “ . . . unit” may be configured to be included in an addressable storage medium or to reproduce one or more processors. Therefore, for example, the “ . . . unit” includes components, such as software components, object-oriented software components, class components, and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, a database, data structures, tables, arrays, and variables. A function provided inside components and “ . . . units” may be combined into a smaller number of components and “ . . . units”, or further divided into additional components and “ . . . units”. 
     The term “module” as used herein means, but is not limited to, a software or hardware component, such as an FPGA or ASIC, which performs certain tasks. A module may advantageously be configured to reside on an addressable storage medium and configured to execute on one or more processors. Thus, a module may include, by way of example, components, such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functionality provided for in the components and modules may be combined into fewer components and modules or further separated into additional components and modules. 
     Although the terms used herein are generic terms which are currently widely used and are selected by taking into consideration functions thereof, the meanings of the terms may vary according to the intentions of persons skilled in the art, legal precedents, or the emergence of new technologies. Furthermore, some specific terms may be randomly selected by the applicant, in which case the meanings of the terms may be specifically defined in the description of the exemplary embodiment. Thus, the terms should be defined not by simple appellations thereof but based on the meanings thereof and the context of the description of the exemplary embodiment. As used herein, expressions such as “at least one of,” when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list. 
     It will be understood that when the terms “includes,” “comprises,” “including,” and/or “comprising,” when used in this specification, specify the presence of stated elements and/or components, but do not preclude the presence or addition of one or more elements and/or components thereof. As used herein, the term “module” refers to a unit that can perform at least one function or operation and may be implemented utilizing any form of hardware, software, or a combination thereof. 
     The portable device in this specification has a display including one or more touch screens and corresponds to a device configured to execute an application or display contents, for example, a tablet Personal Computer (PC), a Portable Multimedia Player (PMP), Personal Digital Assistant (PDA), a smart phone, a mobile phone, or a digital frame. Hereinafter, although a portable device corresponding to a cellular phone or a smart phone will be described with reference to exemplary embodiments, it should be noted that the present invention is not limited thereto. 
       FIG.  1    is a block diagram illustrating a schematic configuration of a portable device according to an exemplary embodiment. The portable device  100  illustrated in  FIG.  1    may be connected to an external device (not shown) by using at least one of a cellular communication module  120 , a sub communication module  130 , and a connector  165 . The “external device” includes at least one of a different device from the portable device  100 , a mobile phone, a smart phone, a tablet Personal Computer (PC), and a computer server. 
     Referring to  FIG.  1   , the portable device  100  includes at least one of touch screen displays  190   a  and  190   b  and a touch screen controller  195 . Also, the portable device  100  includes a controller  110 , the cellular communication module  120 , the sub communication module  130 , a multimedia module  140 , a camera module  150 , a Global Positioning System (GPS) module  155 , an input/output module  160 , a sensor module  170 , a storage unit  175 , and a power supplier  180 . The sub communication module  130  includes at least one of a wireless LAN module  131  and a near field communication module  132 , and the multimedia module  140  includes at least one of a broadcasting communication module  141 , an audio reproduction module  142 , and a video reproduction module  143 . The camera module  150  includes at least one of a first camera  151  and a second camera  152 , and the input/output module  160  includes at least one of a button set  161 , a microphone  162 , a speaker  163 , a vibration motor  164 , the connector  165 , and a keypad  166 . 
     The controller  110  may include a CPU  111 , a Read-Only Memory (ROM)  112  for storing a control program for controlling the portable device  100 , and a Random Access Memory (RAM)  113  for storing a signal or data input from an outside of the portable device  100  or used as a storage area for an operation performed in the portable device  100 . The CPU  111  may include at least one of a single core processor, a dual core processor, a triple core, processor and a quad core processor. The CPU  111 , the ROM  112 , and the RAM  113  may be mutually connected through an internal bus. 
     The controller  110  may control the cellular communication module  120 , the sub communication module  130 , the multimedia module  140 , the camera module  150 , the GPS module  155 , the input/output module  160 , the sensor module  170 , the storage unit  175 , the power supplier  180 , the touch screens  190   a  and  190   b , and the touch screen controller  195 . 
     The cellular communication module  120  connects the portable device  100  with the external device (particularly, a base station of a cellular system) through at least one of or a plurality of antennas (not shown) by using a wireless access technology according to a cellular communication protocol under a control of the controller  110 . The cellular communication module  120  transmits/receives a wireless signal for voice phone communication, video phone communication, a Short Messaging Service (SMS), or a Multimedia Messaging service (MMS) to/from other communicable devices such as a mobile phone, a smart phone, a tablet PC, or another device having a phone number input into the portable device  100 . 
     The sub communication module  130  may include at least one of the wireless LAN module  131  and the near field communication module  132 . For example, the sub communication module  130  may include only the wireless LAN module  131 , only the near field communication module  132 , or both the wireless LAN module  131  and the near field communication module  132 . 
     The wireless LAN module  131  may be connected to an Internet in a place where a wireless Access Point (AP) (not shown) is installed, according to a control of the controller  110 . The wireless LAN module  131  supports a wireless LAN standard (IEEE802.11x) of the Institute of Electrical and Electronics Engineers (IEEE). The near field communication module  132  may wirelessly perform near field communication between the portable device  100  and the external device according to a control of the controller  110 . Near field communication techniques may include Bluetooth, Infrared Data Association (IrDA) and the like. 
     The portable device  100  may include at least one of the cellular communication module  120 , the wireless LAN module  131 , and the near field communication module  132 . For example, the portable device  100  may include a combination of the cellular communication module  120 , the wireless LAN module  131 , and the near field communication module  132  according to a capability of the display device  100 . 
     The multimedia module  140  may include at least one of the broadcasting communication module  141 , the audio reproduction module  142 , and the video reproduction module  143 . The broadcasting communication module  141  may receive a broadcasting signal (for example, a TV broadcasting signal, a radio broadcasting signal, or a data broadcasting signal) and broadcasting additional information (for example, Electric Program Guide (EPS) or Electric Service Guide (ESG)) broadcasted from a broadcasting station through a broadcasting communication antenna (not shown) according to a control of the controller  110 . The audio reproduction module  142  may reproduce a digital audio file (for example, a file having an extension of mp3, wma, ogg or way) stored or received according to a control of the controller  110 . The video reproduction module  143  may reproduce a digital video file (for example, a file having an extension of mpeg, mpg, mp4, avi, mov or mkv) stored or received according to a control of the controller  110 . The video reproduction module  143  may reproduce the digital audio file. 
     The multimedia module  140  may include the audio reproduction module  142  and the video reproduction module  143  except for the broadcasting communication module  141 . Further, the audio reproduction module  142  or the video reproduction module  143  of the multimedia module  140  may be included in the controller  110 . 
     The camera module  150  may include at least one of the first camera  151  and the second camera  152  for photographing a still image or a video according to a control of the controller  110 . The first camera  151  and the second camera  152  may be arranged in a housing of the portable device  100  or connected to the portable device  100  by using a separate connection means. At least one of the first camera  151  or the second camera  152  may include an auxiliary light source (for example, a flash (not shown)) for providing an amount of light required for the photographing. In one embodiment, the first camera  151  may be disposed in a front surface of the portable device  100 , and the second camera  152  may be disposed in a rear surface of the portable device  100 . In another embodiment, the first camera  151  and the second camera  152  may be disposed to be adjacent to each other (for example, an interval between the first camera  151  and the second camera  152  is larger than 1 cm or smaller than 8 cm), and thus a three-dimensional still image or a three-dimensional video may be photographed. 
     The camera module  150  can detect a motion or a shape of the user through at least one of the first camera  151  and the second camera  152  and transmit the detected motion or shape to the controller  110  as an input for executing or controlling the application. In one embodiment, the motion of the user refers to a motion of a hand of the user detected through the first camera or the second camera, and the shape of the user refers to a shape of a face of the user detected through the first camera or the second camera. In another embodiment, the portable device  100  can detect a motion of the user by using another means such as a infrared ray detector and execute or control the application in response to the motion. 
     The GPS module  155  may receive a radio wave from a plurality of GPS satellites (not shown) in Earth orbit and calculate a position of the portable device  100  by using Time of Arrival from the GPS satellites (not shown) to the portable device  100  and GPS parameters. 
     The input/output module  160  may include at least one of at least one physical button  161 , the microphone  162 , the speaker  163 , the vibration motor  164 , the connector  165 , and the keypad  166 . The at least one physical button  161  may be formed in a front surface, a side surface, or a rear surface of the housing of the portable device  100  in a push type or touch type, and may include at least one of a power/lock button, a volume control button, a menu button, a home button, a back button, and a search button. The microphone  162  receives a voice or sound according to a control of the controller  110  and generates an electrical signal. 
     The speaker  163  may output sounds corresponding to various signals (for example, a wireless signal, a broadcasting signal, a digital audio file, a digital video file, photographing a picture or the like) of the cellular communication module  120 , the sub communication module  130 , the multimedia module  140 , or the camera module  150  to an outside of the display device  100  according to a control of the controller  110 . The speaker  163  may output sounds (for example, a button control sound or a ring back tone corresponding to phone communication) corresponding to functions performed by the portable device  100 . One or more speakers  163  may be formed in a proper position or positions of the housing of the portable device  100 . For example, the speaker  163  includes an internal speaker module disposed in a position suitable for approaching ears of the user during phone communication and an external speaker module having a higher output suitable for being used during a reproduction of an audio/video file or watching of broadcasting and disposed in a proper position of the housing of the portable device  100 . 
     The vibration motor  164  may convert an electrical signal to a mechanical vibration according to a control of the controller  110 . For example, when the portable device  100  in a vibration mode receives voice phone communication from another device (not shown), the vibration motor  164  operates. One or more vibration motors  164  may be formed within the housing of the portable device  100 . The vibration motor  164  may operate in response to a touch gesture of the user detected on the touch screens  190   a  and  190   b  and continuous touch motions detected on the touch screens  190   a  and  190   b.    
     The connector  165  may be used as an interface for connecting the portable device  100  with an external device or a power source. The connector  165  may transmit data stored in the storage unit  175  of the portable device  100  to the external device through a wired cable connected to the connector  165  or receive the data from the external device according to a control of the controller  110 . Power may be input or a battery (not shown) may be charged from the power source through the wired cable connected to the connector  165 . 
     The keypad  166  may receive a key input from the user to control the portable device  100 . The keypad  166  includes a physical keypad formed in the portable device  100  and/or a virtual keypad displayed on the touch screens  190   a  and  190   b . The physical keypad formed in the portable device  100  may be omitted according to a capability or a structure of the portable device  100 . 
     The sensor module  170  includes at least one sensor for detecting a state of the portable device  100 . For example, the sensor module  170  may include a proximity sensor for detecting whether the user is close to the portable device  100 , an illumination sensor for detecting an amount of light adjacent to the portable device  100 , and a motion sensor for detecting an operation of the portable device  100  (for example, a rotation of the portable device  100 , an absolute/relative movement of at least one panel included in the portable device  100 , or an acceleration or vibration applied to the portable device  100 ). Each sensor of the sensor module  170  may detect the state, generate a signal corresponding to the detection, and transmit the generated signal to the controller  110 . The sensor of the sensor module  170  may be added or omitted according to a capability of the portable device  100 . 
     The storage unit  175  may store signals, information, or data input/output in accordance with operations of the cellular communication module  120 , the sub communication module  130 , the multimedia module  140 , the camera module  150 , the GPS module  155 , the input/output module  160 , the sensor module  170 , and the touch screens  190   a  and  190   b  according to a control of the controller  110 . The storage unit  175  may store a control program for controlling the portable device  100  or the controller  110  and applications. Hereinafter, the term “storage unit” includes a memory card (for example, an SD card or a memory stick) removable from/mounted to the storage unit  175 , the ROM  112 , the RAM  113 , or the portable device  100 . Further, the storage unit may include a nonvolatile memory, a volatile memory, a Hard Disk Drive (HDD), or a Solid State Drive (SSD). 
     The power supplier  180  may supply power to one battery or a plurality of batteries disposed within the housing of the portable device  100  according to a control of the controller  110 . The one battery or the plurality of batteries supply power to the controller  110  of the portable device  100  and each component module. Further, the power supplier  180  may supply power input from an external power source through the wired cable connected to the connector  165  to the portable device  100 . 
     The touch screens  190   a  and  190   b  are display devices of displaying various applications (for example, phone communication, data transmission, broadcasting, camera and the like) which can be executed by the controller  110  and providing a user interface configured to adapt the various applications, and may receive at least one touch gesture through a user&#39;s body (for example, fingers including a thumb) or a detectable input means (for example, a stylus pen). The user interface may include a predetermined touch area, a soft key, and a soft menu. The touch screens  190   a  and  19   b  may transmit an electrical signal corresponding to the at least one touch gesture input through the user interface to the touch screen controller  195 . Further, the touch screens  190   a  and  190   b  may detect continuous touch motions and transmit electrical signals corresponding to continuous or discontinuous touch motions to the touch screen controller  195 . The touch screens  190   a  and  190   b  may be implemented in, for example, a resistive type, a capacitive type, an infrared type, or an acoustic wave type. 
     The touch screen controller  195  converts the electrical signal received from the touch screens  190   a  and  190   b  to a digital signal (for example, X and Y coordinates) and transmits the digital signal to the controller  110 . The controller  110  may control the touch screens  190   a  and  190   b  by using the digital signal received from the touch screen controller  195 . For example, the controller  110  may allow a soft key displayed on the touch screens  190   a  and  190   b  to be selected or an application corresponding to the soft key to be executed in response to the touch gesture. Further, the touch screen controller  195  may be included in the controller  110 . 
     The touch gesture according to the specification is not limited to a direct contact between the touch screens  190   a  and  190   b  and a user&#39;s body or a touchable input means and may include a non-contact (for example, a case where a detectable interval between the touch screens  190   a  and  190   b  and the user&#39;s body or the touchable input means is 1 cm or shorter). The detectable interval of the touch screens  190   a  and  190   b  may be changed according to a capability or a structure of the portable device  100 . 
     In an exemplary embodiment, the touch gesture may include all types of user gestures which can be detected by the portable device through a direct contact or a close approach to the touch screen. For example, the touch gesture corresponds to a user&#39;s action of selecting one position or a plurality of continuous positions on the touch screen by using a finger of a right hand or left hand (particular, an index finger), a thumb, or an object (for example, a stylus pen) which can be detected by the touch screen, and may include actions such as a touch, a contact, a release of the touch, a tap, a contact and rotate, a pinch, a spread, a touch drag and the like. Here, the touch drag corresponds to a gesture of moving a finger or a thumb in a predetermined direction in a state where the finger, the thumb, or a stylus pen contacts the touch screen, and may include, for example, gestures such as a touch and drag, a flick, a swipe, a slide, a sweep and the like. A contact state with the touch screen may include a state where the finger, the thumb, or the stylus pen directly contacts the touch screen or closely approaches the touch screen without a direct contact. 
     The portable device  100  is a device for executing an application, a widget, and a function which is stored in the storage unit and can be executed by the controller  110  through the touch screen. In general, the touch screen provides application, widgets, functions, and graphic objects (that is, soft key or short-cut icon) corresponding to a group thereof, and the portable device executes a corresponding application, widget, or function in response to the detection of the touch gesture of the user on each graphic object. 
     Here, the widget refers to a mini application which is downloaded and used by the user or can be generated by the user, and includes, for example, a weather widget, a stock widget, a calculator widget, an alarm clock widget, a dictionary widget and the like. A short-cut icon for executing the widget may provide simple advance information through a corresponding widget application. For example, an icon of the weather widget simply provides a current temperature and a weather symbol and a widget application executed through a touch of the icon provides much more information such as weather in each period/area. The application in this specification includes a widget based application and a non-widget based application. 
     In one embodiment, the touch screen is implemented by one panel (or tablet) and displays one or a plurality of task screens corresponding to one or a plurality of applications under a control of the controller. In another embodiment, the touch screen display is implemented by two panels which are physically separated and mutually connected with each other by a predetermined connector, and the panels may be folded in or folded out by a predetermined angle with respect to the connector. Here, the connector may be a hinge, a flexible connector, or a part of a flexible touch screen. In another embodiment, the touch screen display may be implemented by a flexible touch screen which can be folded or bent at least one or more times. The touch screen display displays one or a plurality of task screens related to one or a plurality of applications under a control of the controller. 
       FIG.  2    is a perspective view of the portable device according to an exemplary embodiment.  FIG.  2    shows a configuration in a case where the portable device includes a display device including two touch screens which are connected by a hinge. 
     Referring to  FIG.  2   , the portable device  100  includes a first panel  2  and a second panel  4 , and the first panel  2  and the second panel  4  are connected by a hinge  6  to be relatively movable. One surface of the first panel  2  has a first touch screen  12 , and at least one physical button  5  may be disposed in a lower end of the first touch screen  12 . One surface of the second panel  4  has a second touch screen  14  disposed in parallel with the first touch screen  12 , and at least one physical button  5 ′ may be disposed in a lower end of the second touch screen  14 . The physical buttons  5  and  5 ′ include at least one of a push button and a touch button. As one embodiment, the first touch screen  12  arranged on the first panel  2  having a speaker  20  and a microphone  22  operates as a main screen, and the second touch screen  14  arranged on the second panel  4  operates as a sub screen. As one embodiment, the first panel  2  includes a front camera  24 , and the second panel  4  includes a rear camera  26 . As another example, as the front camera  24  is disposed in the same surface as that of the second screen  14 , in a state where the first panel  2  and the second panel  4  are unfolded, the front camera  24  may work as a front camera, and in a state where the first panel  2  and the second panel  4  are folded, the front camera  24  may work as a rear camera. 
     As long as the first panel  2  and the second panel  4  are connected by the hinge  6  to be relatively movable, the portable device  100  can be any device such as a mobile phone, a notebook, a tablet PC, a PMP or the like. Although a case where the first touch screen  12  and the second touch screen  14  are included in the first panel  2  and the second panel  4 , respectively has been described, the case can be applied to a device in which the touch screen display is provided to only one of the two panels. Further, at least one of the function buttons  5  and  5 ′ in lower ends of the touch screens may be omitted. Furthermore, although a case where the first panel  2  and the second panel  4  are connected by the hinge  6  has been described as an example, the hinge  6  may be replaced with another component as long as the first panel  2  and the second panel  4  can be folded through a relative movement. 
     The portable device includes a display device having a first touch screen and a second touch screen which are physically or graphically separated, and supports various screen modes as shown in  FIG.  3    by using the two touch screens. 
       FIGS.  3 A to  3 D  are diagrams illustrating screen modes according to a relative angle between the first panel  2  and the second panel  4  of the portable device  100 . The relative angle θ is a rotation angle at which the second panel  4  rotates with respect to the first panel  2  in a predetermined direction (for example, counterclockwise). 
       FIG.  3 A  is a perspective view of the folded portable device  100 , which shows a state where the first panel  2  and the second panel  4  contact each other while each of the touch screens  12  and  14  of the first panel  2  and the second panel  4  faces outward, that is, a state where the portable device  100  is completely folded outward. The state corresponds to a dual screen. At this time, the relative angle θ is 0 degrees. For example, when the relative angle between the first and second panels  2  and  4  ranges from 0 to 60 degrees, the portable device recognizes a dual screen mode. The dual screen mode is useful when the portable device is in a locked state in which the portable device is not used and useful in a call application. The touch screen  12  in a front surface may display a task screen of at least one application and the touch screen  14  in a rear surface may be turned off in the dual screen mode. Some applications can turn on the touch screen  14  in the rear surface by using an option menu. 
       FIG.  3 B  shows a state where the first panel  2  and the second panel  4  are parallel in which the relative angle θ is 180 degrees or close to 180 degrees within a predetermined range, that is, an unfolded state. The state corresponds to a double screen.  7  For example, when the relative angle θ between the first and second panels  2  and  4  ranges from 175 to 185 degrees, the portable device may consider that the first and second panels  2  and  4  are unfolded. The double screen mode may provide various view modes of displaying two task screens for two applications in the two touch screens  12  and  14 , respectively, displaying two task screens for one application in the two touch screens  12  and  14 , or widely displaying one task screen for one application in the two touch screens  12  and  14 . When there is no application executed within one touch screen, the corresponding touch screen may display a home screen. 
       FIG.  3 C  shows a state where the relative angle θ of the second panel  4  with respect to the first panel  2  exceeds 180 degrees, that is, a state where the two touch screens  12  and  14  are slightly folded inward. That state corresponds to an in-folded screen. For example, when the relative angle θ between the first and second panels  2  and  4  ranges from 180 to 210 degrees, the portable device recognizes an in-folded screen mode. The in-folded screen mode corresponds to the state where the two touch screens  12  and  14  are slightly folded inward and is useful when the portable device is used as a similar form to that of a notebook or an electric book. The in-folded screen mode may be used similarly to the double screen mode. 
       FIG.  3 D  shows a state where the relative angle θ of the second panel  4  with respect to the first panel  2  is smaller than 180 degrees, that is, a state where the two touch screens  12  and  14  are nearly completely folded outward in opposite directions. The state corresponds to an out-folded screen. For example, when the relative angle θ between the first and second panels  2  and  4  ranges from 30 to 90 degrees, the portable device recognizes an out-folded screen mode. The out-folded screen mode has a structure in which the two touch screens  12  and  14  are folded outward and is useful when the portable device is charged because the portable device can stand on the floor in a triangle shape, when the portable device is used as a digital clock or frame, and when personal broadcasting, a movie, a video or the like is watched for a long time. As another embodiment, the out-folded screen mode may be applied to an application requiring cooperation or interaction between two or more users, for example, a video conference, a collaborative game or the like. Some applications may display a task screen in only the touch screen  12  of the front surface in the dual screen mode and turn off the touch screen  14  of the rear surface. Some applications may turn on the touch screen  14  of the rear surface by using an option menu. 
       FIG.  4    is a perspective view of the portable device according to another exemplary embodiment. As illustrated in  FIG.  4   , the portable device  100  includes a display having two flexible touch screens  12  and  14 . The two touch screens  12  and  14  may be mutually connected by a flexible connector  18  and freely folded or bent by a flexible connector  20 . 
       FIGS.  5 A,  5 B, and  5 C  are perspective views of the portable device according to another exemplary embodiment.  FIGS.  5 A,  5 B, and  5 C  illustrate a configuration in which the display device of the portable device  100  is unfolded, a configuration in which the display device is partially closed, and a configuration in which the display device is closed, respectively. Here, although it is illustrated that the portable device  100  has a tri-folded configuration, the portable device  100  may have a bi-folded configuration, a tri-folded configuration or more, or partially folded configuration. In  FIGS.  5 A,  5 B, and  5 C , the display device of the portable device  100  may be implemented by two or more foldable touch screens  12 ,  14 , and  16  which are divided by one or more foldable boundaries  12   a  and  12   b.    
     When the portable device is turned on and completely booted, the portable device provides a home screen through the touch screen. Further, the portable device provides the home screen when there is no application which is being executed or by an input of an external home button. The home screen can be designated basically by a manufacturer and edited by the user and guides the portable device to easily move to various executable applications, widgets, and functions. 
     The portable device includes a home screen function which provides two pages designated as the home screen through a touch screen display device including a first touch screen and a second touch screen arranged on at least one foldable panel and navigates pages in response to a touch gesture of the user on the home screen. 
       FIGS.  6 A to  6 G  illustrate a user interface of the home screen according to one or more exemplary embodiments. 
     Referring to  FIG.  6 A , the first touch screen  12  displays a first page  202  of the home screen and the second touch screen  14  displays a second page  204  of the home screen. The first and second touch screens  12  and  14  may be physically or graphically separated. 
     The first page  202  of the home screen includes a first group including at least one widget area  212  designated as the home screen and/or at least one shortcut icon  214  and the second page  204  includes a second group including at least one widget area  218  designated as the home screen and/or at least one short icon. The first page  202  and the second page  204  can display the widget areas  212  and  218  and/or the shortcut icon  214  in a common background image or respective background images designated as a background screen. As a selectable embodiment, one background image may be displayed over the first and second touch screens  12  and  14 . 
     Each shortcut icon corresponds to each application or each application group, and the corresponding application is executed or shortcut icons included in the corresponding application group are displayed through a detection of a user&#39;s touch. Each widget area or each shortcut icon may be basically provided when the portable device is manufactured or may be formed by the user. 
     In addition, the first touch screen  12  can further display a counter  202   a  indicating a page of the home screen, frequently used applications, for example, a call application, a contact information application, a message application, a dock area  216  including short icons of an application menu providing application lists, and a status bar  206  providing signal intensity indicator(s) for wireless communication such as cellular or WiFi communication, a Bluetooth connection mode, a received message, a battery status indicator, and a current time together with the first page  202 . The second touch screen  14  can further display a page counter  204   a  and a status bar  208 . The status bar on the second touch screen  14  can provide information different from that of the first touch screen  12 . The status bars  206  and  208  may be displayed together with the home screen or the application or may be omitted. The status bars  206  and  208  are maintained within the first and second touch screens  12  and  14  regardless of switching of pages. In the following description, description of whether the status bars  206  and  208  are displayed will be omitted. 
     The home screen may further provide additional pages including one or more widget areas and/or one or more icons within a predetermined maximum number of pages, and the pages are switched by a pre-designated touch gesture. 
     The portable device detects a pre-designated touch gesture  200   a  to switch a page of the home screen in at least one of the first touch screen  12  and the second touch screen  14  and proceeds to  FIG.  6 B . 
     Referring to  FIG.  6 B , the first and second touch screens  12  and  14  display the following two pages designated as the home screen, that is, third and fourth pages  232  and  234  and page counters  232   a  and  234   a  in response to the detection of the touch gesture  200   a . The third and fourth pages  232  and  234  may include a widget area and/or an icon different from those of the first and second pages  202  and  204 . The third and fourth pages  232  and  234  are displayed in the second touch screen  14  together with the page counters  232   a  and  234   a  while sliding in a direction from the second touch screen  14  to the first touch screen  12 , and the third page  232  and the page counter  232   a  may be displayed over both the first and second touch screens  12  and  14  during the sliding. As an embodiment, the dock area  216  providing lists of frequently used applications may be fixedly displayed in a designated position within the first touch screen  12  regardless of the page switching (that is, independently). 
     As an example, the touch gesture  200   a  includes a touch drag in a direction from one position of the second touch screen  14  to the first touch screen  12  (or opposite direction). As another example, the touch gesture  200   a  includes a touch drag in a direction from one position of the second touch screen  14  to one position of the first touch screen  12  (or opposite direction). As still another example, the touch gesture  200   a  includes a touch drag of passing though a hinge or connector between the first and second touch screens  12  and  14 . As a selectable embodiment, it is possible that the touch drag  200   a  for switching the page of the home screen moves by a predetermined distance or more. As another example, the touch gesture  200   a  includes a flick on the first or second screen  12  or  14  in a direction from the second touch screen  14  to the first touch screen  12 . 
     When a pre-designated touch gesture  200   b  is detected from one of the first touch screen  12  and the second touch screen  14  while the third and fourth pages  232  and  234  are displayed in the first and second touch screens  12  and  14 , the portable device proceeds to  FIG.  6 C . 
     Referring to  FIG.  6 C , the first and second touch screens  12  and  14  display the following two pages, that is, fifth and sixth pages  242  and  244  and page counters  242   a  and  244   a , respectively, in response to the touch gesture  200   b . Similar to  FIG.  6   , the fifth and six pages  242  and  244  may be displayed while sliding in a direction from the second touch screen  14  to the first touch screen  12  according to the touch gesture  200   b , and the dock area  216  is fixed on a designated position within the first touch screen  12  regardless of the touch gesture  200   b.    
     Although not illustrated, when a touch drag in a direction from one position of the first touch screen  12  to the second touch screen  14  is detected while the fifth and sixth pages  242  and  244  are displayed, the portable device  100  displays the previous pages, that is, the third pate  232  and the fourth page  234  in the first and second touch screens in response to the touch drag. Similarly, the third and fourth pages  232  and  234  may be displayed while sliding through the hinge in a direction from the touch screen  12  to the second touch screen  14  according to the touch drag. 
     When the first and second touch screens  12  and  14  are connected to be discontinuous by the hinge or a separate connector, pages of the home screen may be displayed over both the first and second touch screens  12  and  14  when sliding through the hinge or connector as illustrated in  FIG.  6 C . 
     The portable device switches the home screen in the unit of one page or two pages by two touch gestures which are differently defined. For example, in  FIG.  6 A , the touch gesture  200   a  is defined as a touch drag of moving on the home screen by a predetermined distance or more, and the portable device switches the first and second pages  202  and  204  of the first and second touch screens  12  and  14  to the third and fourth pages  232  and  234 , that is, in the unit of two pages in response to the detection of the touch drag  200   a . Further, the home screen may be switched in the unit of one page by a touch gesture of moving by a short distance. That is, in  FIG.  6 A , when a pre-designated touch gesture, for example, a flick in a direction from the second touch screen  14  to the first touch screen  12  is detected from one of the first touch screen  12  and the second touch screen  14  to shortly switch the home screen, the portable device proceeds to  FIG.  6 D . 
     Referring to  FIG.  6 D , in response to the flick detected from one of the first and second touch screens  12  and  14  displaying the first and second pages  202  and  204 , the portable device displays the second page  204  in the first touch screen  12  and displays the third page  232  in the second touch screen  14 . The second and third pages  204  and  232  are displayed while sliding in a direction from the second touch screen  14  to the first touch screen  12  according to a flick and, and the second page  202  may be displayed over both the first and second touch screens  12  and  14 . 
       FIGS.  6 E to  6 G  illustrate a scenario of switching the page of the home screen while an application different from the home screen is displayed in the first and second touch screens  12  and  14 . 
     Referring to  FIG.  6 E , the first touch screen  12  displays the first page  202 , the page counter  202   a , and the dock area  216  of the home screen, and the second touch screen  14  displays another application  240 . In the shown example, the application  240  is a music play application. When a pre-designated touch gesture  200   c  for switching the page of the home screen is detected from the first touch screen  12 , the portable device proceeds to  FIG.  6 H . As an example, the touch gesture  200   c  is generated within the first touch screen  12  and corresponds to a flick or a touch drag which moves in a direction from the second touch screen  14  to the first touch screen  12 . 
     Referring to  FIG.  6 F , the portable device replaces the first page  202  and the page counter  202   a  of the first touch screen  12  with the second page  204  and the page counter  204   a  of the second page  204  and then displays the replaced second page  204  and page counter  204   a  in response to the detection of the touch gesture  200   c . Here, the dock area  216  of the first touch screen  12  and the application  240  of the second touch screen  14  are maintained in spite of the touch gesture  200   c . As one embodiment, the second page  204  may be displayed while sliding in a direction from the second touch screen  14  to the first touch screen  12  according to a motion direction and a speed of the touch gesture  200   c.    
     When a touch gesture  200   e  in a direction of the second touch screen  14  is detected from the first touch screen  12  displaying the second page  204 , the portable device returns to  FIG.  6 E  to display the first page  202  corresponding to a previous page in the first touch screen  12  and maintain the dock area  216  of the first touch screen  12  and the application  240  of the second touch screen  14 . When a touch gesture  200   d  in a direction from the second touch screen  14  to the first touch screen  12  is detected from the first touch screen  12  displaying the second page  204 , the portable device moves to  FIG.  6 G  to display a next page. 
     Referring to  FIG.  6 G , the portable device replaces the second page  204  and the page counter  204   a  of the first touch screen  12  with the third page  232  and the page counter  232   a  of the home screen and displays the replaced third page  232  and page counter  232   a  in response to the detection of the touch gesture  200   d . Similarly, the dock area  216  of the first touch screen  12  and the application  240  of the second touch screen  14  are maintained in spite of the touch gesture  200   d . When a touch gesture  200   f  in a direction of the second touch screen  14  is detected from the first touch screen  12  displaying the third page  232 , the portable device returns to  FIG.  6 F  to display the second page  204 . 
       FIGS.  7 A to  7 J  illustrate scenarios of adding an icon of an application to the home screen displayed in the first and second touch screens  12  and  14 . 
     Referring to  FIG.  7 A , the first touch screen  12  displays the first page  202  of the home screen, and the second touch screen  14  displays the second page  204  of the home screen. Although not illustrated, even when another application or information, other than the home screen is displayed in the second touch screen  14 , the following scenario of adding the icon may be similarly applied. When a predetermined touch gesture  210   a , for example, a touch which is maintained for a predetermined effective time or more, that is, a long-tap is detected from one of the first and second touch screens  12  and  14  displaying the home screen, for example, from the first touch screen  12  in the shown example, the portable device proceeds to  FIG.  7 C . 
     As a selectable embodiment, an icon may be added using a menu button  252  which is one of physical buttons arranged in the first panel having the first touch screen  12  as illustrated in  FIG.  7 B . The portable device detects an input  210   b  of the menu button  252  arranged in the first panel, for example, a tap gesture or a touch-and-hold on a touch detection type menu button and displays a menu window  250  for the home screen in a lower end of the first touch screen  12 . The menu window  250  includes at least one of an icon addition key, a background screen setting key, a search key, a notification setting key, an icon editing key, and a home screen setting key. When a predetermined touch gesture  210   c , for example, a tap gesture is detected from the icon addition key within the menu window  250 , the portable device proceeds to  FIG.  7 C . 
     Referring to  FIG.  7 C , the first touch screen  12  displays an item addition popup window  252  for adding items of the home screen to the first page  202  in response to detections of the touch gestures  210   a  and  210   c . The popup window  252  includes at least a shortcut icon item. When a tap gesture  210   d  is detected from the shortcut icon item, the portable device proceeds to  FIG.  7 D . 
     Referring to  FIG.  7 D , the portable device replaces the icon addition popup window  252  with a shortcut icon selection window  254  and displays the replaced shortcut icon selection window  254  in response to the detection of the tap gesture  210   d . As another embodiment, the shortcut icon selection window  254  may be displayed to be overwritten on the icon addition popup window  252 . The shortcut icon selection window  254  includes at least an application menu item. When a tap gesture  120   e  is detected from the application menu item, the portable device proceeds to  FIG.  7 E . 
     Referring to  FIG.  7 E , the portable device displays existing information, that is, the first page  202  of the home screen in the first touch screen  12  and displays a first page  260  of the application menu in the second touch screen  14  in response to the detection of the tap gesture  210   e . The application menu is configured to provide lists of applications which are stored and executable in the portable device, and the first page  260  includes at least some of shortcut icons of applications registered in the application menu. When the application menu includes a plurality of pages, the second touch screen  14  can display a page counter  260   a  together with the first page  260 . 
     When the touch gesture  210   d  which starts at one  260   b  of the icons included in the first page  260  of the application menu displayed in the second touch screen  14 , that is, “ICON7” in the shown example and is released on the first touch screen  12 , for example, a touch drag and drop is detected, the portable device proceeds to  FIG.  7 F . 
     Referring to  FIG.  7 F , the portable device displays an icon  260   c  which is a copy of the icon  260   b  selected by the touch gesture  210   d  in the first touch screen  12  in response to the detection of the touch gesture  210   d . For example, the icon  260   c  may be disposed in a position where the touch gesture  210   d  is released. 
     When the predetermined touch gesture  210   e  for switching the page, for example, a flick which starts at one position of the second touch screen  14  and moves in a direction of the first touch screen  12  is detected while the first page  260  of the application menu is displayed in the second touch screen  14 , the portable device proceeds to  FIG.  7 G . The touch gesture  210   e  starts and is released within the second touch screen  14 . 
     Referring to  FIG.  7 G , the portable device displays a second page  262  of the application menu in the second touch screen  14  in response to the detection of the touch gesture  210   e . The first page  260  is replaced with the second page  262  and the second page  262  may be displayed while sliding in a direction of the first touch screen  12 . When the application menu includes a plurality of pages, the second touch screen  14  can display a page counter  262   a  together with the second page  262 . When one  262   b  of the icons included in the second page  262  of the application menu displayed in the second touch screen  14 , that is, the touch gesture  210   f  which starts at “ICON23” and is released on the first touch screen  12 , for example, a touch drag and drop is detected, the portable device proceeds to  FIG.  7 H . 
     Referring to  FIG.  7 H , the portable device displays an icon  262   c  which is a copy of the icon  262   b  selected by the touch gesture  210   f  in the first touch screen  12  in response to the detection of the touch gesture  210   f . For example, the icon  262   c  may be disposed in a position where the touch gesture  210   f  is released. 
     When the home screen is displayed in the first touch screen  12  and the back button or the home button which is one of the physical buttons arranged in the first panel is input while the application list is displayed in the second touch screen  14  as illustrated in  FIGS.  7 F to  7 H , the portable device stores icons displayed in the first touch screen  12  as the home screen and displays the next page  204  of the home screen instead of removing the application list from the second touch screen  14  as illustrated in  FIG.  7 I . 
     As another embodiment, when the home screen is displayed in the first touch screen  12  and the menu button which is one of the physical buttons arranged in the first panel is input while the application menu for editing the home screen is displayed in the second touch screen  14 , the portable device displays the menu window  256  for completing the home screen editing. The menu window  256  includes at least one of a storage key and an ignore key. When a tap gesture  210   h  is detected from the storage key within the menu window  256 , the portable device stores icons, which include icons  260   c  and  262   c  copied from the application lists  260  and  262 , displayed in the first touch screen  12  as the home screen and displays previous information, that is, the second page  204  of the home screen instead of removing the application menu from the second touch screen  14  as illustrated in  FIG.  7 J . 
     Although not illustrated, when the tap gesture is detected from the disregard key within the menu window  256 , the portable device removes the added icons  260   c  and  262   c  from the first touch screen  12  and returns to  FIG.  7 A . 
     The aforementioned dual home screen function may be similarly applied to the application menu which is a basic application of the portable device. The application menu may be loaded by an icon or menu displayed in the home screen or an external button and provide more application lists, that is, icons in comparison with the home screen. The application menu provides a plurality of pages including a plurality of icon groups designated as the application menu. 
     The portable device provides two pages designated as the application menu through the display device including the first touch screen and the second touch screen arranged on at least one foldable panel, and moves and navigates in the unit of two pages in response to a touch gesture of the user 
       FIGS.  8 A and  8 B  illustrate a user interface of the application menu according to one or more exemplary embodiments. 
     Referring to  FIG.  8 A , when a tap gesture is detected from the icon of the application list provided in the home screen or the physically configured home button is input, the application menu is executed and first and second pages  272  and  274  designated as the application menu are displayed in the first and second touch screens  12  and  14 . Each of the pages  272  and  274  includes one or more icons corresponding to each of the applications or application groups. When the application menu includes a plurality of pages, the first and second touch screens  12  and  14  may further display page counters  272   a  and  274   a  together with the first and second pages  272  and  274 . 
     When a pre-designated touch gesture  280   a  in a direction of the first touch screen  12 , for example, a flick or a touch drag is detected from one position of the second touch screen  14 , the portable device displays the next pages of the application menu, that is, a third page  276  including a third icon group and a fourth page  278  including a fourth icon group in the first and second touch screens  12  and  14  in response to the touch gesture  280   a  as illustrated in  FIG.  8 B . Here, the third page  276  and the fourth page  278  may be displayed while sliding in a direction from the second touch screen  14  to the first touch screen  12  according to a motion direction and a speed of the touch gesture  280   a . Similarly, the first and second touch screens  12  and  14  may further display page counters  276   a  and  278   a  together with the third page  276  and the fourth page  278 . 
     Although not illustrated, when a touch gesture in a direction from the first touch screen  12  to the second touch screen  14  is detected from the first or second touch screen  12  or  14 , the portable device displays previous pages of the application menu, that is, the first page  272  including the first icon group and the second page  274  including the second icon group in the first and second touch screens  12  an  14  in response to the touch gesture. Similarly, the first and second pages  272  and  274  may be displayed while sliding in a direction from the first touch screen  12  to the second touch screen  14  according to the touch gesture. 
     When the first and second touch screens  12  and  14  are connected not to be continuous by the hinge or separate connector, the pages may be displayed over both the first and second touch screens  12  and  14  when sliding through the hinge or connector. As a selectable embodiment, each icon within each page may be displayed while rapidly passing though the hinge or connector without being displayed over both the first and second touch screens  12  and  14 . 
     When a plurality of items such as icons of the home screen or the application menu or thumbnail images of a photo gallery application are displayed in two touch screens in a list or a grid form, the items may be scrolled (or translated) together by the touch gesture. The touch gesture may be a flick, a sweep, or a touch drag. 
     As one embodiment, the touch gesture may start at one position within the first touch screen  12  and be released at another position (farther from the second touch screen  14 ) within the first touch screen  12 . As an embodiment, the touch gesture may start at one position within the second touch screen  14  and be released at another position (closer to the first touch screen  12 ) within the second touch screen  14  or released at one position within the first touch screen  12 . 
     When the touch gesture starts and is released within one of the first and second touch screens  12  and  14 , the portable device replaces two pages of the items displayed in the first and second touch screens  12  and  14  with the next or previous two pages according to a motion direction of the touch gesture and then displays the replaced next or previous two pages. As another embodiment, the items displayed in the first and second touch screens  12  and  14  may be scrolled according to a motion direction, a motion distance, and a speed of the touch gesture. As an example, the portable device scrolls items corresponding to the distance or speed at which the touch gesture has moved. 
     As another embodiment, when the touch gesture is a flick which is generated in one of the first and second touch screens  12  and  14  and moves through the hinge (or connector), the portable device scrolls two pages displayed in the first and second touch screens  12  and  14  up to first or last two pages according to a motion direction of the touch gesture. As still another embodiment, when the touch gesture is the sweep which is generated in one of the first and second touch screens  12  and  14  and moves through the hinge (or connector), the portable device scrolls and displays the two pages displayed in the first and second touch screens  12  and  14  by the speed of the touch gesture. 
     When the items are scrolled, each of the items is not displayed over the two touch screens. That is, when each of the items reaches the hinge (or connector), it skips over the hinge and then is displayed in the next touch screen. 
     The touch screens of the portable device are switched to a portrait view mode or a landscape view mode based on a detection signal received from one or more accelerometers and then display information according to the switched mode. That is, the accelerometer may be included in the sensor module  170  and senses a rotation of the portable device. The accelerometer detects the switching between the portrait view mode in which the touch screens of the portable device are arranged in a left side and a right side and the landscape view mode in which the touch screens of the portable device are arranged in an upper side and a lower side, and generates the detection signal. 
     When the portable device is rotated substantially by 90 degrees and switched to the landscape view mode while displaying items in a grid form in the portrait view mode, the items within the grid may be rotated in a horizontal direction and scrolled. When the items are horizontally arranged, the items on the grid may be scrolled in a vertical direction according to a selection of the manufacturer or user or simultaneously scrolled in both an upper screen and a lower screen in a horizontal direction. Similarly, a movement of each grid is based on a direction and a speed of the motion of the touch gesture. 
     As another selectable embodiment, when a list is displayed in one touch screen and not displayed in the other touch screen in the portrait view mode, the list is displayed in both the two touch screens according to a setting of the manufacturer or user or information of another touch screen is extensively displayed in the two touch screens when the portable device rotates by 90 degrees. 
     When the portable device is rotated by 90 degrees and switched to the landscape view mode while displaying the home screen or the application menu in the portrait view mode, the portable device may operate to display a search window or a pre-designated application (for example, a search window of an Internet browsing application) in at least one of the touch screens. 
       FIG.  8 C  illustrates an example of a user interface for using the landscape view mode of the home screen according to an exemplary embodiment. Here, although a touch screen layout in a case where the portable device rotates by 90 degrees in a left direction is illustrated, the case can be applied when the portable device rotates by 90 degrees in a right direction. In the landscape view mode, it is described that the touch screen located in an upper part is the first touch screen  12 . 
     Referring to  FIG.  8 C , when portable device is switched to the landscape view mode, that is, the portable device rotates by about 90 degrees while providing the home screen or pages of the application menu through the first and second touch screens  12  and  14  in the portrait view mode as illustrated in  FIG.  6 A  or  FIG.  8 A , the first touch screen  12  displays a search window  282  interworking with the Internet browsing application or a pre-designated application. As one embodiment, the search window  282  may be displayed with or on the previously displayed home screen or page of the application menu of which a mode is switched to the landscape view mode. As another embodiment, the search window  282  may be displayed in an upper part of the second touch screen  14 . As a selectable embodiment, the dock area  216  may be displayed in a position of one of the first and second touch screens  12  and  14 , for example, a right end of the first touch screen  12  in the landscape view mode and shortcut icons within the dock area may be vertically arranged. 
     As a selectable embodiment, when the switching to the landscape view mode is performed, the second touch screen  14  replaces the page of the home screen with at least one pre-designated application, that is, a task manager screen including at least one running application  286  and displays the replaced page in the shown example. At this time, preview windows including simple information on each running application  286  or last executed information may be displayed in the task manager screen of the second touch screen  14  in an in activated state, for example, in a shaded state, or a shortcut icon of each running application  286  may be displayed in a grid or a list form. Further, the preview windows of the running application  286  may be displayed to partially overlap each other or displayed in a grid form not to overlap each other. The preview window refers to an area in a deactivated state in which a touch input is not allowed in comparison with a task screen which actually executes an application and provides a user interface such as the touch input. 
     As another embodiment, when the switching to the landscape view mode is performed, the second touch screen  14  displays the previously displayed home screen or page of the application menu of which a mode is switched to the landscape view mode and the search window  282  or displays a pre-designated application and the search window  282 . The pre-designated application may be designated by the manufacturer or user. For example, the pre-designated application may be a quick search application, an Internet browsing application, a recommended application list in the landscape view mode provided by the portable device, and another application designated by the user. 
     As a selectable embodiment, when a touch gesture of the user is detected from one of the preview windows (or shortcut icons) of the running application, the second touch screen  14  can display a task screen (providing an activated user interface) through an execution of the corresponding application. 
     When a touch gesture (for example, tap gesture) of the user is detected from an input area  282   a  included in the search window  282  displayed in the first touch screen  12  in the landscape view mode in which the first touch screen is located in the upper part and the second touch screen  14  is located in the lower part, a virtual keypad for receiving a text input, that is, a keypad area (not shown) is displayed in a predetermined area, for example, a lower part of the first touch screen  12 , a lower part of the second touch screen  14 , or the whole second touch screen  14 . When a keyword desired to be searched for through the keypad area is input by the user and then a touch gesture (for example, tap gesture) of the user is detected from a search execution key  282   b  displayed within the search window  282  or next to the search window  282 , search results corresponding to the keyword provided by the search application interworking with the search window  282  are displayed in the first touch screen  12 , the second touch screen  14 , or entire areas including the first and second touch screens  12  and  14 . 
     The portable device includes the display device including the first touch screen and the second touch screen arranged on at least one foldable panel and supports the following various view modes by using the two touch screens. 
     A multi mode or a multi tasking mode refers to a mode in which different applications are displayed in two touch screens, respectively, and each of the applications may respond to a touch gesture detected from the corresponding touch screen. For example, the first touch screen displays a photo gallery application, and the second touch screen displays an Internet browsing application. The portable device can swap information of the two touch screens by a pre-designated touch gesture. For example, the touch gesture includes two touches which are generated in the two touch screens, respectively and move to the hinge (or connector). The portable device can replace the photo gallery application of the first touch screen with the Internet browsing application and replace the Internet browsing application of the second touch screen with the photo gallery application in response to the detection of the two touches. 
     A main-sub mode (or slit mode) displays two task screens for one application in two touch screens, respectively. The two task screens provide task screens having different depths (or levels) of the application or task screens having different functions. That is, some applications may be configured to provide a plurality of task screens and the task screens may have different depths. 
     For example, the photo gallery application can provide a search screen including a plurality of thumbnail images and a full image screen displaying a picture image of one thumbnail image selected from the thumbnail images with a larger size, that is, with a full size through different touch screens. In this case, the full image screen may be designated to have a final depth. As another example, a music play application provides a playlist screen including a plurality of listed music and a music play screen for playing one of the music through different touch screens. In this case, the music play screen may be designated to have a final depth. 
     A full mode (or expanded mode) extensively displays one task screen of one application in two touch screens regardless of the hinge (or connector). For example, the first touch screen displays a first page of thumbnail images provided through the photo gallery application and the second touch screen displays a second page of the thumbnail images. As another example, one picture image is displayed to fully fills the whole of the first touch screen and the second touch screen. Here, displaying the picture image to fully fill the touch screens means that the picture image is displayed to fully fill horizontal widths and/or vertical widths of the first and second touch screens. As still another example, the first touch screen displays a map area having a first scale of a map application and the second touch screen displays a map area having a more detailed scale. 
     A change between the view modes may be achieved according to a running application, a detection of the touch gesture on the first and/or second touch screens, or a motion gesture of the portable device. The motion gesture includes a physical motion such as a rotation of the portable device and bending/folding of the first and/or second touch screens. Here, the bending/folding of the touch screens may refer to bending/folding within a predetermined relative angle. As a selectable embodiment, the change between the view modes is loaded by expanding a setting menu of the portable device or an upper status bar of the main touch screen or two touch screens and may be achieved by using a view mode changing button disposed within a quick panel allowing a quick control of a change in a status and a mode of the portable device. 
       FIGS.  9 A to  9 J  illustrate examples of a change in the view mode according to a touch gesture according to one or more exemplary embodiments. 
     As illustrated in  FIG.  9 A , the first touch screen  12  displays a first application  302  and the second touch screen  14  displays a second application  304 . For example, the first touch screen  12  displays the photo gallery application and the second touch screen  14  displays the Internet browsing application. 
     As illustrated in  FIG.  9 B , when the portable device  100  detects a predetermined touch gesture  306  from the first and/or second touch screens  12  and/or  14 , the first application  302  of the first touch screen  12  is displayed in both the first touch screen  12  and the second touch screen  14 . At this time, as an example, the first application  302  may be displayed in the two touch screens  12  and  14  in the full mode or separately displayed in the two touch screens  12  and  14  through two task screens in the main-sub mode. 
     For example, the touch gesture  306  includes actually simultaneously generated two or more flicks which move in a direction from the first touch screen  12  to the second touch screen  14 . As another example, the touch gesture  306  includes actually simultaneously generated two or more touch drags which move in a direction from the first touch screen  12  to the second touch screen  14 . Specifically, when the portable device  100  detects a plurality of touches starting at the first touch screen  12  and detects that the detected touches simultaneously move in a direction from the first touch screen  12  to the second touch screen  14 , the portable device  100  displays the first application  302  in the both the first touch screen  12  and the second touch screen  14 . As one embodiment, the flicks or the touch drags may move through the hinge or connector between the first and second touch screens  12  and  14 . 
     Here, although it has been illustrated that the flicks or the touch drags are generated in parallel, the flicks or the touch drags can be generated irregularly. As a selectable embodiment, when an interval between the flicks or the touch drags is equal to or smaller than a predetermined value, that is, 2 cm, the portable device can recognize the touch gesture for changing the view mode. As another selectable embodiment, positions of the first touch screen  12  where the touches are first detected may be horizontally or vertically arranged side by side. 
     As still another embodiment, the touch gesture  306  includes a pinch gesture for expanding a selected area, that is, a pinch zoom-in gesture. As an embodiment, two touches of the pinch zoom-in gesture start at the first touch screen  12 , wherein a first touch is released within the first touch screen  12  and a second touch is released within the second touch screen  14 . 
     At this time, the task screen of the first application  302  may be displayed while sliding in a direction from the first touch screen  12  to the second touch screen  14  according to a motion (and a speed) of the touch gesture  306 . When the first and second touch screens  12  and  14  are connected by the hinge or separated connector not to be continuous, the task screen of the first application  302  may be displayed over both the first and second touch screens  12  and  14  when sliding through the hinge or connector. 
     Although not illustrated, the first application  302  enlarged over the first and second touch screens  12  and  14  by the touch gesture  306  may be reduced within the first touch screen  12  by another pre-designated touch gesture. As one example, when a pinch zoom-out gesture including two touches which start at first and second touch screens  12  and  14 , respectively and are released in one touch screen, for example, the second touch screen  14  is detected, the portable device reduces the first application  302  and displays the reduced first application  302  in the second touch screen  14 . At this time, the first touch screen  12  can display the second application  304  or the home screen. 
     [2-2. From the Full Mode to the Main-Sub Mode] 
     When the first application  302  is the photo gallery application, the photo gallery application  302  displays the first page of a plurality of thumbnail images in the first touch screen  12  as illustrated in  FIG.  9 A . In response to the detection of the touch gesture  306  of  FIG.  9 B , the portable device displays the first and second pages  302   a  and  302   b  of the plurality of thumbnail images in the first and second touch screens  12  and  14  as illustrated in  FIG.  9 C . At this time, according to a motion of the touch gesture  306 , the first page  302   b  of the thumbnail images displayed in the first touch screen  12  slides to the second touch screen  14  and the second page  302   a  of the thumbnail images slides to the first touch screen  12  following the first page  302   b.    
     When a plurality of items such as the thumbnail image are displayed in the first and second touch screens  12  and  14  in a grid form, the items may be scrolled (that is, translated) according to a motion and a speed of the touch gesture as illustrated and described in  FIGS.  8 A and  8 B . That is, when a touch gesture such as the flick or sweep is generated in one of the first and second touch screens  12  and  14 , the thumbnail images are scrolled according to a motion direction and a speed of the touch gesture. At this time, the thumbnail images may be scrolled over the hinge (or connector) between the first and second touch screens  12  and  14 . 
     Referring to  FIG.  9 D , the portable device  100  detects a touch gesture  310  (for example, tap gesture) of the user on a first thumbnail image  306  which is one of the thumbnail images  302   a  of the first touch screen  12 , that is, “thumbnail21”. Then, as illustrated in  FIG.  9 E , the second touch screen  14  replaces the first page  302   b  of the thumbnail images with a picture image  306   a  of the first thumbnail image  306  and displays the replaced picture image  306   a  in response to the detection of the touch gesture  310 . The picture image  306   a  has a larger size than the first thumbnail image  306  and may be displayed to fill one of a horizontal width and a vertical width of the second touch screen  14 . As illustrated in  FIG.  9 F , when a touch gesture  312  (for example, tap gesture) of the user is detected on a second thumbnail image  308  among the thumbnail images  302   a  of the first touch screen  12 , the picture image  306   a  of the first thumbnail image  306  is replaced with a picture image  308   a  of the second thumbnail image  308  and the replaced picture image  308   a  is displayed in the second touch screen  14  in response to the detection of the touch gesture  312 . 
     Referring to  FIG.  9 G , the portable device  100  detects a predetermined touch gesture  320  on the first picture image  308   a  displayed in the second touch screen  14  in a state where the first touch screen  12  displays the plurality of thumbnail images  302   a  provided through the photo gallery application and the second touch screen  14  displays the first picture image  308   a  of the first thumbnail image selected from the plurality of thumbnail images  302   a . Then, as illustrated in  FIG.  9 H , the portable device  100  enlarges the first picture image  308   a  and displays the enlarged first picture image  308   a  to fully fill the first touch screen  12  and the second touch screen  14 . The first picture image  308   b  expands up to the first touch screen  12  while covering the thumbnail images  302   a  of the first touch screen  12 . When the expansion is completed, a part (for example, a left half) of the first picture image  308   a  is displayed in the first touch screen  12  and the remaining part (for example, a right half) of the first picture image  308   b  is displayed in the second touch screen  14 . As a selectable embodiment, when the first picture image  308   b  is an image generated in the portrait view mode (vertically long image), the first picture image  308   b  may be displayed in one of the first and second touch screens  12  and  14 . 
     As one embodiment, the touch gesture  320  includes a pinch gesture of expanding a selected area, that is, a pinch zoom-in gesture. First and second touches of the pinch zoom-in gesture are all generated in the second touch screen  14 , wherein the first touch is released within the second touch screen  14  and the second touch is released within the first touch screen  12 . As another embodiment, the touch gesture  320  includes two touch drags which are simultaneously generated in the second touch screen  14  and move farther from each other in approximately opposite directions. As one example, at least one of the touch drags may start at one position of the second touch screen  14  and end at another position of the second touch screen  14 . As another example, at least one of the touch drags may start at one position of the second touch screen  14  and end at one position of the first touch screen  12 . 
     When the portable device  100  substantially simultaneously or sequentially detects two touches from the second touch screen  14  and substantially simultaneously detects that the detected touches are father from each other in opposite directions or continuously farther from each other in approximately opposite directions, the portable device  100  expands the first picture image  308   a  and displays the expanded the first picture image  308   a  to fully fill the first touch screen  12  and the second touch screen  14 . 
     Although not illustrated, when a pinch zoom-out gesture including two touches which start at the first and second touch screens  12  and  14 , respectively and are released on one touch screen, for example, the first touch screen  12  is detected while the first picture image  308   a  is displayed in the first and second touch screens  12  and  14 , the portable device reduces the first picture image  308   a  and displays the reduced first picture image  308   a  to fully fill the first touch screen  12 . 
     As illustrated in  FIG.  9 I , the portable device  100  detects a touch gesture  322  in a predetermined direction from the first picture image  308   c  displayed in both the first touch screen  12  and the second touch screen  14 , for example, a flick or a touch drag in a direction from the second touch screen  14  to the first touch screen  12  (or opposite direction). Then, as illustrated in  FIG.  9 J , the portable device  100  replaces the first picture image  308   c  displayed in the first touch screen  12  and the second touch screen  14  with a second picture image  324  continuous to the first picture image  308   c  and displays the replaced second picture image  324  in response to the touch gesture  322 . At this time, the first picture image  308   c  may be removed while sliding in a direction from the second touch screen  14  to the first touch screen  12  (or opposite direction) according to a direction and a speed of a motion of the touch drag  322 . The second picture image  324  slides within the first touch screen  12  and the second touch screen  14  while following the first picture image  308   c.    
     As a selectable embodiment, the touch drag  322  may be performed on one touch screen. As another selectable embodiment, the touch drag  322  may be performed over the two touch screens  12  and  14 , that is, passing through the hinge. 
     The portable device can provide a familiar and a new home user interface such as a foldable wallet or compact powder through the display device including the first touch screen and the second touch screen arranged on at least one foldable panel. It is referred to as a pocket mode home screen in this specification. The portable device can provide the home screen as illustrated in  FIG.  6    or the pocket mode home screen which will be described later according to a setting made when the portable device is manufactured or a setting of the user. As an embodiment, the pocket mode home screen may be usefully used in a double screen mode or an in-folded screen mode. 
       FIGS.  10 A to  10 H  illustrate user interfaces of the pocket mode home screen according to one or more exemplary embodiments. 
     Referring to  FIG.  10 A , the first touch screen  12  displays areas  402 ,  404 ,  406 , and  408  in a form of cards, for example a credit card or identification card, each stored in a card slot of a wallet which include some information on widgets or applications designated as the home screen and further displays a dock area  410  including icons of frequently used applications. Each of the areas  402 ,  404 ,  406 , and  408  may have a form of the received credit card partially hidden by a graphic image embodying a slit for receiving the credit card in the wallet and may be vertically aligned with the received credit cards. The areas  402  to  408  display at least one of simple information provided by the widget or application and a shortcut key for executing a predetermined function. The simple information includes information which the user desires to first know through the application and may be updated in real time according to the application. For example, an area related to a message application can display whether a newly received message exists through a notice such as a flickering phrase of “NEW”. As a selectable embodiment, the area  408  located in a bottommost part may have a form of the received credit card partially hidden by a slit of a diagonal line. 
     When a pre-designated touch gesture, for example, a tap gesture or a touch and hold is detected from one of the areas  402 ,  404 ,  406 , and  408 , the portable device displays an application of the corresponding area to occupy the whole of the first touch screen  12  or the second touch screen  14  or displays the application to occupy the whole of the first touch screen  12  and the second touch screen  14 . 
     At least some of the areas (for example, the areas  402 ,  404 , and/or  408 ) display simple information provided by the widget or application, and the simple information may be enlarged and displayed in response to a pre-designated touch gesture. For example, the area  402  of a schedule widget includes today&#39;s date and time and titles of N schedules (for example, one or two schedules), the area  404  of a weather widget includes a current city, a current temperature, and a weather icon, and the area  408  of a business card widget includes a person&#39;s name in contact information, shortcut keys for connecting a call and/or sending a message, and a picture image. The picture image may be replaced with a default image. 
     As one embodiment, in response to the detection of a predetermined touch gesture, for example, a flick or a touch drag up from one of the areas  402 ,  404 , and  408 , the portable device expands the corresponding area in a form of the credit card partially withdrawn from a graphic image having a slit form. The expanded area includes more information in comparison with the corresponding widget or application. The expanded area may be reconstructed to an original size in response to the detection of a touch drag down from the enlarged area or the detection of a touch gesture from another area. 
     At least some of the areas (for example, the area  406 ) display shortcut keys for functions provided by the application while operating as the background. For example, the area  406  of a music play application displays a status bar showing an album image, a title, a musician, and a play status of a played music and additionally provides shortcut keys such as a previous music selecting key, a stop/play key, and a next music selecting key. When a tap gesture is detected from one of the shortcut keys, the music play application executes a function corresponding to the corresponding shortcut key as the background. 
     Referring to  FIG.  10 B , the portable device detects a pre-designated touch gesture  420 , for example, a flick or a touch drag up from the area  402  of the schedule widget. Referring to  FIG.  10 C , in response to the detection of the touch gesture  420 , the area  402  of the schedule widget is expanded in a top direction and then the expanded area  402   a  is displayed. The expanded area  402   a  displays time and titles of M schedules (for example, three or more schedules) and may further selectively display a weekly schedule according to an expanded length. The area  402  may be expanded in a top direction according to a movement of the touch gesture  420  and expanded to reach a terminus of the first touch screen  12  within a predetermined maximum size. 
     Referring to  FIG.  10 D , the portable device detects a pre-designated touch gesture  422 , for example, a tap gesture or a touch drag from one of the shortcut keys and the status bar included in the area  406  of the music play application. Then, the music play application performs a function of playing music, playing previous music, stopping music, playing next music, or moving a play position. The area  406  of the music play application which operates as the background and does not require an area expansion may be embodied and displayed in a form of a sewed label, not the form of the received credit card. 
     Referring to  FIG.  10 E , the portable device detects a pre-designated touch gesture  424 , for example, a flick or a touch drag up from the area  404  of the weather widget. In response to the detection of the touch gesture  424 , the area  404  of the weather widget is expanded in a top direction and then the expanded area is displayed. The expanded area  404   a  may further display more detailed information on the weather, for example, additional information on today&#39;s weather and weekly weather. The area  404  of the weather widget may be expanded in a top direction according to a movement of the touch gesture  424  and expanded to reach a terminus of the first touch screen  12  within a predetermined maximum size. The area  404  of the weather widget may be expanded to cover at least some of the area  402  of the schedule widget which had been located in an upper part. As one embodiment, the area  404  cannot be expanded to exceed a predetermined maximum range. When an expanded length of the expanded area  404   a  reaches the maximum range, the expanded area  404   a  remains in an expanded state or is reconstructed to the area  404  in an original size. 
     Referring to  FIG.  10 F , the portable device detects a pre-designated touch gesture  426 , for example, a flick or a touch drag up in a top direction from the area  408  of the business card widget. In response to the detection of the touch gesture  426 , the area  408  of the business card widget is expanded in a top direction and the expanded area  408   a  is displayed. The expanded area  408   a  may further include a picture image  408   d  of the person in the contact information and more detailed information  408   e  in comparison with those before the expansion, for example, a mobile phone number, an office phone number, a birthday, an address, an e-mail address and the like. The area  408  may be expanded to cover at least one widget ( 406 ,  404 , and/or  402 ) which had been located in upper parts according to a movement of the touch gesture  426  and expanded to reach a terminus of the first touch screen  12  within a predetermined maximum range. As one embodiment, the area  408  cannot be expanded to exceed a predetermined maximum rage. When an expanded length of the expanded area  408   a  reaches the maximum range, the expanded area  408   a  remains in an expanded state or is automatically returned to the area  408  in an original size. 
     Referring to  FIG.  10 G , the area  408  of the business card widget and the expanded area  408   a  display at least one of shortcut keys  408   b  and  408   c  for connecting a call and sending a message. When a pre-designated touch gesture  428 , for example, a tap gesture is detected from the shortcut key  408   b  for connecting the call, the portable device proceeds to  FIG.  10 H . 
     Referring to  FIG.  10 H , the portable device attempts to connect a call to a phone number related to the area  408  of the business card through a call application and displays a dialing screen  408   f  of the call application in some or all of the first and second touch screens  12  and  14 . The dialing screen  408   f  may replace at least a part of the pocket mode home screen of the first and second touch screens  12  and  14  and then be displayed. In the shown example, the dialing screen  408   f  is displayed in the whole of the first touch screen  12  and includes a call participant identification area including a picture image and a phone number of a counterpart call participant and soft keys of mid-call functions such as adding a phone number, calling a dial pad, ending the call, connecting a speakerphone, mute, and a headset. As a selectable embodiment, the second touch screen  14  maintains the home screen, is turned off, or provides a guide message screen  408   g  for recommending to fold the portable device for the call. 
     Although not illustrated, when a tap gesture is detected from the shortcut key  408   c  for sending the message included in the area  408  of the business card widget or the expanded area  408   a , a text input area and a virtual keypad for sending the message provided by the message application are displayed in some or all of the first touch screen  12 . As one embodiment, the virtual keypad is displayed while partially covering the lower part of the first touch screen  12 . As another embodiment, the virtual keypad is continuously displayed over the lower part of the first touch screen  12  and a lower part of the second touch screen  14 . As a selectable embodiment, the keypad is displayed in the lower part of the first touch screen  12  and may be expanded through an expand button provided within the virtual keypad and displayed in both the lower parts of the first and second touch screens  12  and  14 . 
       FIG.  11 A  to  FIG.  11 F  illustrate user interfaces of the home screen in the pocket mode according to one or more exemplary embodiments. 
     Referring to  FIG.  11 A , the second touch screen  12  displays first areas  412  of applications designated as the home screen. The first areas  412  are displayed in a form of stored cards partially hidden by a graphic image in a form of a slit for receiving the cards within a wallet and include at least one of simple information (for example, two to three lines) provided by each application and a shortcut key  416  for executing a predetermined function. The simple information may be automatically updated in real time according to the application. As one embodiment, an area of a Social Networking Service (SNS) application can display whether an update is recently performed and display a part of contents of a recently updated message. 
     As a selectable embodiment, an area  414  of a photo gallery application which is one of the areas displayed in the second touch screen  12  can provide a predetermined number of thumbnail images. As an embodiment, the area  414  additionally includes a shortcut key for changing view modes of the thumbnail images. For example, the shortcut key includes a slider switch. Further, the thumbnail images may be scrolled according to an arranged direction of the thumbnail images within the area  414 , for example, a motion direction and a speed of a touch gesture in a horizontal direction. As a selectable embodiment, because the area  414  of the photo gallery application does not need an area expansion, the area  414  may be embodied and displayed in a form of a sewed label, not the form of a received credit card. 
     The second touch screen  14  displays the first areas  412  including simple information on a predetermined number of applications, for example, three applications according to a setting of the home screen in the pocket mode. It is possible that the first areas  412  are sequentially arranged in a vertical direction like the stored cards. For example, each of the first areas  412  includes a name of a graphic symbol of the application, information of one or two lines provided by the application, and an indicator showing an updated state of the application. When a pre-designated touch gesture (for example, a flick up or a touch drag up) is detected from each of the first areas  412 , the corresponding first area  412  may be expanded to a top direction within a predetermined maximum size. 
     Referring to  FIG.  11 B , when a pinch gesture  430  for reducing the area, that is, a pinch zoom-out is detected from the first areas  412 , each of the first areas  412  is reduced and reduced areas  412   a  of other applications are further displayed in a space within the second touch screen  14  generated by the reduced areas. That is, the reduced first areas  412  and the second areas  412   a  including the reduced areas of the other applications include more applications (for example, six or more applications) in comparison with the first areas  412 , and accordingly display less information in comparison with the first areas  412 , for example, only a name, a graphic symbol, and an update indicator of the application with one line. 
     As illustrated in  FIG.  11 C , when a touch gesture  432  in a predetermined direction, that is, a flick up/down or a touch drag up/down is detected from the second areas  412   a , the portable device proceeds to  FIG.  11 D . Referring to  FIG.  11 D , the portable device displays reduced areas  412   b  of applications designated as the home screen in the pocket mode while scrolling the reduced areas  412   b  in a top direction or a bottom direction in response to the touch gesture  432 . 
     When a pinch gesture  434  for expanding the area, for example, a pinch zoom-in is detected from the reduced areas  412   b , the portable device proceeds to  FIG.  11 E . Referring to  FIG.  11 E , the reduced areas  412   b  according to the pinch gesture  434  are expanded to have an original size  412   c  and reduced areas (for example, topmost part and/or bottommost areas) of some applications by the area expansion are not displayed in the second touch screen  14  anymore. The areas  412   c  include a number of applications according to a basic setting of the home screen in the pocket mode, for example, five applications. 
     Referring to  FIG.  11 F , when a pre-designated touch gesture  436 , for example, a flick in a top direction or a touch drag up is detected from one of the reduced areas  412   a  and  412   b  or the areas  412  and  412   c  having the original sizes, the corresponding area is expanded in a top direction and the expanded area  412   d  is displayed. The expanded area  412   d  may further display more detailed information of the corresponding application, for example, a recently uploaded image and more information on a recent activity. The expanded area  412   d  is generated by an expansion in a top direction according to a movement of the touch gesture  436  and may be expanded to reach a predetermined maximum range. According to a type of application, the expanded area  412   d  can provide at least one of a text input window having a size which can be included in the expanded area  412   d  and soft keys for predetermined functions together with the more detailed information. 
     As one example, the area in the form of the received credit card related to the message application is expanded by a touch drag up of the user and displays a miniaturized text input window and a transmission shortcut key in an area secured through the expansion. 
     As a selectable embodiment, when the pre-designated touch gesture  436 , for example, a tap gesture is detected from a first area which is one of the areas  412 ,  412   a ,  412   b , and  412   c , the portable device expands the first area and displays the expanded first area in the second touch screen  14 . At this time, the first area may be expanded in the same or similar sizes to those of all of the areas  412 ,  412   a ,  412   b , and  412   c  or expanded to occupy the whole second touch screen  14 . For example, the area in the form of the received credit card related to the social network service application is expanded by a tap gesture by the user and displays a predetermined number of recently received messages in an area secured through the expansion. The expanded area may include shortcut keys such as forward, reply, copy and the like on each message. The expanded area may be reconstructed to have an original size by a touch on another area or a pinch gesture. 
     As another selectable embodiment, when the pre-designated touch gesture  436 , for example, a tap gesture is detected from the first area which is one of the areas  412 ,  412   a ,  412   b , and  412   c , the portable device displays an application corresponding to the first area in the whole second touch screen  14 . 
     The portable device can display a gallery map application corresponding to a combination of the photo gallery application and the map application through the display device including the first touch screen and the second touch screen arranged on at least one foldable panel. The first touch screen and the second touch screen displays a map and at least one picture image registered in the map, respectively. The gallery map application can register and manage at least one picture image of one position on the map. As one embodiment, the gallery map application receives the picture image registered in a server located in the Internet and position information on the picture image from the server, links the picture image with a position indicated by the position information, and manages the linked information. The picture image may be shot or generated in the position or include contents related to the position. As one embodiment, the gallery map application may be useful for the double screen mode or the in-folded screen mode. 
       FIGS.  12 A to  121    illustrate user interfaces of the gallery map application according to one or more exemplary embodiments. 
     Referring to  FIG.  12 A , the first touch screen  12  displays a map area  502  provided by the gallery map application. For example, the map area  502  may include a geographical area of a predetermined scale including a current position of the user or a geographical area of a predetermined scale including a position designated by the user. The map area  502  includes at least one of position indicators  504   a ,  504   b , and  504   c  indicating a search result, a tourist attraction spot, or a position in which the picture image is registered. 
     The second touch screen  14  displays a gallery area  506   a  in which thumbnail images of the picture images registered in positions included in the map area  502  are listed. The gallery area  506   a  lists at least some of the thumbnail images of the registered picture images of the position indicators  504   a ,  504   b , and  504   c  included in the map area  502 . When all the thumbnail images cannot be simultaneously displayed in the gallery area  506   a , the thumbnail images may be divisibly displayed in a plurality of pages, and the second touch screen  14  can scroll the thumbnail images according to a touch drag detected from the gallery area  506   a . The thumbnail images may be displayed in a grid view mode, a list view mode, or a group view mode according to a basic setting or a setting of the user. In the group view mode, thumbnail images for each group may be displayed in a disordered form where at least some of the thumbnail images overlap. 
     When a touch gesture  512  in a predetermined direction, for example, a flick or a touch drag is detected from the map area  502  displayed in the first touch screen  12 , a map area  502   a  moved according to a motion of the touch gesture  512  is displayed in the first touch screen  12  as illustrated in  FIG.  12 B . Then, the second touch screen  14  displays a gallery area  506   b  in which at least some of the thumbnail images of the registered picture images of the position indicators  504   b ,  504   c ,  504   d , and  504   e  included in the map area  502   a  are listed. 
     Although not illustrated, when a pre-designated touch gesture, for example, a tap gesture is detected from one (for example, the position indicator  504   c ) of the position indicators  504   b ,  504   c ,  504   d , and  504   e  displayed on the map area  502   a  displayed in the first touch screen  12 , the gallery area of the second touch screen  14  can display at least some of the thumbnail images of the registered picture image of the selected position indicator  504   c.    
     Referring to  FIG.  12 C , the first touch screen  12  displays the map area  502   b  and the gallery area  506   c  of the second touch screen  14  displays the thumbnail images of the registered picture images of the positions included in the map area  502   b . The portable device detects a pre-designated touch gesture  514 , for example, a tap gesture or a touch and hold from one  504   a  of the position indicators  504   a ,  504   c ,  504   d ,  504   f , and  504   g  displayed on the map area  502   b  displayed in the first touch screen  12 . Then, in response to the detection of the touch gesture, the first touch screen  12  displays thumbnail images  520  of the registered images of the position indicator  504   a  in an area adjacent to the position indicator  504   a    514  as illustrated in  FIG.  12 D . The thumbnail images  520  may be displayed in the grid form or in the group view mode where at least some of the thumbnail images  520  overlap each other, and a name  520   a  of the registered image group of the position indicator  504   a , for example, “A Castle” may be displayed together with the thumbnail images  520 . 
     Referring to  FIG.  12 E , the portable device detects a touch gesture from one  504   g  of the position indicators  504   a ,  504   c ,  504   d ,  504   f , and  504   g  displayed on the map area  502   b  displayed in the first touch screen  12  and displays thumbnail images  522  of registered images of the position indicator  504   g  in an area adjacent to the position indicator  504   g . The thumbnail images  522  may be displayed in the grid form or the partially overlapping form, and a name  522   b  of the registered image group of the position indicator  504   g , for example, “B Café” may be displayed together with the thumbnail images  522 . 
     The second touch screen  14  provides a soft key  530  for selecting the view mode to change the view mode of the gallery area  506   c  into the group view mode or the grid view mode. For example, the soft key  530  includes a slider switch. When a touch of the user is detected from the slider switch and the slider switch moves to an icon indicating the view mode in a group form according to the touch, a gallery area  506   e  of the second touch screen  14  groups the registered thumbnail images of the position indicators  504   a ,  504   c ,  504   d ,  504   f , and  504   g  included in the map area  502   b  displayed in the first touch screen  12  for each position and then displays the grouped thumbnail images. In the group view mode, the thumbnail images of each group may be displayed in a disordered form where the thumbnail images partially overlap each other. 
     Referring to  FIG.  12 F , the first touch screen  12  displays the map area  502   b  provided by the gallery map application. The map area  502   b  includes position indicators  504   a ,  504   c ,  504   d ,  504   f , and  504   g  indicating a search result, a registered tourist attraction spot, or a position in which the picture image is registered. The second touch screen  14  includes a gallery area  506   e  in which thumbnail images of the picture images registered in positions included in the map area  502   b  are listed. The gallery area  506   e  displays at least some of the registered thumbnail images of the position indicators  504   a ,  504   c ,  504   d ,  504   f , and  504   g  included in the map area  502   b  in the grid view mode or the group view mode. 
     When a pre-designated touch gesture  530 , for example, a tap gesture or a touch and hold (that is, long tap) is detected from one (for example, the position indicator  504   a ) of the position indicators  504   a ,  504   c ,  504   d ,  504   f , and  504   g  on the map area  502   b , the first touch screen  12  displays a menu window  530   a  for selecting a path in an area adjacent to the position indicator  504   a . The menu window  530   a  includes a start key and an arrival key. When a tap gesture  530   b  is detected from the start key of the menu window  530   a , the gallery map application designates the position indicator  504   a  as a start position in response to the detection of the tap gesture  530   b . At this time, the position indicator  504   a  may be changed to a conspicuous color, for example, red in order to be visually distinguished from other displayed position indicators  504   c ,  504   d ,  504   f , and  504   g.    
     Referring to  FIG.  12 G , when a pre-designated touch gesture  532 , for example, a tap gesture or a touch and hold is detected from one (for example, the position indicator  504   d ) of the position indicators  504   a ,  504   c ,  504   d ,  504   f , and  504   g  on the map area  502   b  displayed in the first touch screen  12 , the first touch screen  12  displays a menu window  532   a  for selecting a path in an area adjacent to the position indicator  504   d . The menu window  532   a  includes a start key and an arrival key. When a tap gesture  532   b  is detected from the arrival key of the menu window  532   a , the gallery map application designates the position indicator  504   d  as an arrival position in response to the detection of the tap gesture  532   b . At this time, the position indicator  504   d  may be changed to a conspicuous color, for example, red in order to be visually distinguished from other displayed position indicators  504   c ,  504   f , and  504   g.    
     When the start position or the arrival position is registered, the gallery map application displays a slide show control area  542  including information on the path from the start position to the arrival position in a lower part of the first touch screen  12 . The slide show control area  542  may be displayed while partially covering the map area  502   b.    
     Referring to  FIG.  12 H , when the start position  504   a  and the arrival position  504   d  are registered, the gallery map application displays a path  540  from the start position  504   a  to the arrival position  504   d  in a graphic line form in the map area  502   b  of the first touch screen  12 . The path  540  is displayed along an actual road between the start position  504   a  and the arrival position  504   d  and may include at least one indicator  504   c  existing between the start position  504   a  and the arrival position  504   d  as an intermediate position. The slide show control area  542  displayed in the lower part of the first touch screen  12  may include a path trace bar  544  showing position indicators included in the path from the start position to the arrival position and movement states according to the path and a slide show view key  546  for selecting to initiate a slide show of the picture images included in the path  540 . As another embodiment, the slide show control area  542  is displayed in response to the display of the path  540 . 
     When a pre-designated touch gesture, for example, a tap gesture is detected from the slide show view key  546 , the portable device removes the map area  502   b  from the first touch screen  12  and reproduces the slide show of the picture images registered in the positions included in the path  540  as illustrated in  FIG.  12 I . As one embodiment, the picture images are sequentially displayed to completely fill at least one of a horizontal width and a vertical width of the first touch screen  12  during the slide show. During the slide show, the path trace bar  544  of the slide show control area  542  includes a current slide indicator indicating a position of the picture image currently displayed in the first touch screen  12  and the slide show control area  542  provides a slide show stop key  548  for selecting to stop the slide show instead of the slide show view key  546 . 
     As a selectable embodiment, the slide show control area  542  may be hidden from the first touch screen  12  during the slide show in order not to interrupt viewing of the slid picture images. The slide show control area  542  may be displayed again in a predetermined area of the first touch screen  12  for the slide show by, for example, detecting a predetermined touch gesture in the lower part of the first touch screen. 
     The portable device can display a task manager area including icons of a plurality of running applications through the display device including the first touch screen and the second touch screen arranged on one foldable panel. As another embodiment, the task manager area may include icons of favorite applications designated by the user. The task manager area may be disposed in pre-designated positions of the first touch screen and the second touch screen, for example, lower parts of the first touch screen and the second touch screen. That is, some of the icons of the task manager area are displayed in the lower part of the first touch screen and the remaining icons are displayed in the lower part of the second touch screen. The icons of the task manager area may be continuously disposed in the lower parts of the first and second touch screens. 
       FIGS.  13 A to  13 J  illustrate user interfaces of a task manager panel according to one or more exemplary embodiments. 
     Referring to  FIG.  13 A , the first touch screen  12  displays a task screen  610  of a first application and the second touch screen  14  displays a task screen  612  of a second application. The task screens  610  and  612  have sizes to fill displayable areas of the first and second touch screens  12  and  14 , display information executed by each application, and provide a user interface. Although a multi mode in which the first and second touch screens  12  and  14  display the task screens  610  and  612  of different applications is illustrated herein, an execution of the task manager which will be described below may be similarly applied to a case where the home screen or the application menu is displayed in at least one of the first and second touch screens  12  and  14  or the first and second touch screens  12  and  14  operate in the main-sub mode or the full mode. 
     The portable device detects a predetermined command or a user gesture for executing the task manager. The command or the user gesture includes, for example, at least one of an input of a physical button included in the housing of the portable device, a detection of a touch on a predetermined area within at least one of the first and second touch screens  12  and  14 , a detection of a touch on a soft key provided through at least one of the first and second touch screens  12  and  14 , and a control of a soft menu. 
       FIG.  13 A  illustrates an example of executing a task manager function by using one  600   a  of the physical buttons arranged in a second panel including the second touch screen  14 . The button  600   a  for executing the task manager function may be, for example, a home button which is one of the touch detection typed physical buttons arranged in the second panel. When the portable device detects an input  602  of the home button  600   a  arranged in the second panel, for example, a tap gesture on the home button or a touch and hold, the portable device proceeds to  FIG.  13 B . 
     Referring to  FIG.  13 B , the portable device displays task manager panels  604   a  and  604   b  in predetermined positions of the first and/or second touch screens  12  or/and  14 , for example, lower parts of the first and second touch screens  12  and  14  in response to the input  602 . The task manager panels  604   a  and  604   b  form the task manager areas and are located in different touch screens  12  and  14  and disposed close to each other to be continuous. As another embodiment, the task manager panels  604   a  and  604   b  may be disposed in basically set positions or positions designated by the user, for example, upper parts of the first and/or second touch screens  12  and  14 , a left part of the first touch screen  12 , a right part of the second touch screen  14 , and a right part of the first touch screen  12 , and a left part of the second touch screen  14 . 
     With displays of the task manager panels  604   a  and  604   b , the first and second touch screens  12  and  14  replace the task screens  610  and  612  of the first and second applications with preview windows  610   a  and  612   a  of the first and second applications. The preview windows  610   a  and  612   a  have smaller sizes in comparison with the task screens  610  and  612  and may be displayed with a shadow in order to indicate a deactivated state in which the user interface such as a touch input or the like is not allowed. 
     In the shown example, the task manager panels  604   a  and  604   b  are divisibly displayed through two touch screens including the first touch screen  12  and the second touch screen  14  and include at least some of the icons of the running applications. For example, each of the task manager panels  604   a  and  604   b  may include a maximum of four icons which do not overlap each other. That is, the first task manager panel  604   a  includes icons of first to fourth running applications App # 1  to App # 4 , and the second task manager panel  604   b  includes icons of fifth to eighth running applications App # 5  to App # 8 . When the number of running applications exceeds a maximum number of icons which can be displayed in the task manager panels  604   a  and  604   b , that is, when the number of running applications exceeds eight, the task manager panels  604   a  and  604   b  display only eight icons and may further display other icons by scrolling the displayed icons in response to a touch gesture. 
     As one embodiment, orders of the applications included in the task manager panels  604   a  and  604   b  are based on a last played time. Icons  610   b  and  612   b  of the first and second applications displayed in the first and second touch screens  12  and  14  before the execution of the task manger are located in first and second positions within the task manager panels  604   a  and  604   b . When the number of running applications is smaller than a maximum number (for example, eight) of icons which can be included in the two task manager panels  604   a  and  604   b , the icons of the running applications may be center-aligned from the hinge between the first and second touch screens  12  and  14 . The center-aligned icons may move within the first task manger panel  604   a  or the second task manager panel  604   b  by a touch drag in a left direction or a right direction. 
     An end indicator  606  (for example, in an X form) for immediately ending the corresponding running application may be attached to each icon. A tap gesture is detected from the end indicator  606  attached to the application App # 8  which is one of the displayed icons, the portable device ends the application App # 8  of the corresponding icon. When a preview screen of the application App # 8  is displayed within the first and/or second touch screens  12  and/or  14 , the preview screen of the application App # 8  of the corresponding touch screen is replaced with one page of the home screen. When the preview screen of the application App # 8  is not displayed within the first and/or second touch screens  12  and/or  14 , the application App # 8  ends as the background. 
     Referring to  FIG.  13 C , the portable device detects a touch gesture  602   a  acting in parallel to a direction in which the icons are arranged on the first and/or second task manger panels  604   a  and  604   b , for example, a flick or a touch drag in a left direction or a right direction and scrolls and displays the icons displayed in the first and second task manager panels  604   a  and  604   b  according to the touch gesture  602 . The icons designated as the task manger may be scrolled while rotating. When passing though the hinge between the first and second touch screens  12  and  14  according to the touch gesture  602   a , each of the icons may be displayed over the two touch screens  12  and  14 . As another embodiment, when passing through the hinge according to the touch gesture  602   a , each of the icons is displayed to skip the hinge without being divisibly displayed in the two touch screens  12  and  14 . 
     Referring to  FIG.  13 D , the portable device detects a predetermined touch gesture  602   b  which starts at one  614   b  of the icons included in the first and/or second task manager panels  604   a  and/or  604   b  and heads for outsides of the first and/or second task manger panels  604   a  and/or  604   b , for example, a touch drag which starts at the icon  614   b  of the application App # 5  and is released at an area included in the first touch screen except for the first task manager panel  604   a . As illustrated in  FIG.  13 E , the first touch screen  12  replaces the preview window  610   a  of the first application displayed in the first touch screen  12  with a preview window  614   a  of the application App # 5  related to the icon  614   b  and displays the replaced preview window  614   a  in response to the detection of the touch drag  602   b.    
     Referring to  FIG.  13 F , the portable device detects a touch drag  602   c  from an icon  616   b  of the application App # 11  included in the first task manager panel  604   a  to an area included in the first touch screen  12  except for the first task manager panel  604   a . The touch drag  602   c  starts at the icon  616   b  and is released at one point within an area included in the first touch screen  12  except for the first task manger panel  604   a . As illustrated in  FIG.  13 G , the first touch screen  12  replaces the preview window  614   a  of the application App # 5  with the preview window  616   a  of the application App # 11  related to the icon  616   b  and displays the replaced preview window  616   a  in response to the detection of the touch drag  602   c.    
     Although it has been illustrated that the replacement of the preview window made in the first touch screen  12  in  FIGS.  13 D to  13 G , the preview window of the application corresponding to the icon included in the first task manager panel  604   a  may be drawn to the second touch screen  14  or the preview window of the application corresponding to the icon included in the second task manager panel  604   b  may be drawn to the first touch screen  12  according to a start position and a release position of the touch drag. 
     Referring to  FIG.  13 G , the portable device detects a pre-designated touch gesture  602   d  headed for an inside of the second task manager panel  604   b  displayed in the second touch screen  14 , for example, a touch drag which starts at one position of the preview window  612   a  and is released at one position within the second task manager panel  604   b  from the preview window  612   a  of the second application displayed in the second touch screen  14 . Then, the second touch screen  14  converts the preview window  612   a  to the icon  612   b  of the second application in response to the detection of the touch drag  602   d  and moves the icon  612   b  to the second task manager panel  604   b  according to the touch drag  602   d . The icon  612   b  may be disposed between icons conventionally displayed within the second task manager panel  604   b , that is, a position where the touch drag  602   d  is released. 
     Referring to  FIG.  13 H , as the icon  612   b  enters an area of the second task manager panel  604   b  according to the touch drag  602   d , the second task manager panel  604   b  inserts the icon  612   b  between the previously displayed icons and displays them together. The icons displayed within the first and second task manager panels  604   a  and  604   b  may rearranged with the newly entered icon  612   b . At this time, the second touch screen  14  replaces the preview window  612   a  of the second application with a preview window  618   a  of the running application App # 10  and displays the replaced preview window  618   a.    
     After the preview window  612   a  is removed according to the touch drag  602   d , the second touch screen  14  may not display any preview window or task window except for the second task manager panel  604   b . As a selectable embodiment, the second touch screen  14  can display a first page of the home screen after the preview window  612   a  is removed. Thereafter, when the preview window  616   a  of the first touch screen  12  is removed by the touch drag headed for the task manager panel  604   a  or  604   b , the portable device displays the first page of the home screen in the first touch screen  12  and displays a second page of the home screen in the second touch screen  14 . At this time, the first page of the home screen may be displayed together with a dock area in the first or second touch screen  12  or  14 . 
     Referring to  FIG.  13 I , the portable device detects a predetermined command or user gesture for ending the task manager while the preview windows  616   a  and  620   a  of the applications are displayed in the first and second touch screens  12  and  14 . The command or the user gesture includes, for example, at least one of an input of a physical button included in the housing of the portable device, a detection of a touch on a predetermined area within at least one of the first and second touch screens  12  and  14 , a detection of a touch on a soft key provided through at least one of the first and second touch screens  12  and  14 , and a control of a soft menu. 
       FIG.  13 I  illustrates an example of executing a task manager function by using one  600   b  of the physical buttons arranged in a second panel including the second touch screen  14 . The button  600   b  for executing the task manager function may be, for example, a back button which is one of the touch detection typed physical buttons arranged in the second panel. The portable device detects an input  602   f  of the back button  600   b  arranged in the second panel, for example, a tap gesture or a touch and hold on the back button  600   b.    
     Referring to  FIG.  13 J , in response to the input  602   f , the portable device removes the first and second task manager panels  604   a  and  604   b  from the first and second touch screens  12  and  14  and replaces the preview windows  616   a  and  620   a  which previously displayed in the first and second touch screens  12  and  14  with activated task screens  616  and  620  of the corresponding applications and displays the replaced task screens  616  and  620 . 
     The portable device can support a personal broadcasting service by the user through the display device including the first touch screen and the second touch screen arranged on at least one foldable panel. The user having the portable device who corresponds to a broadcaster of the personal broadcasting service can broadcast an image recorded through a camera of the portable device by using the personal broadcasting application installed in the portable device. 
       FIGS.  14 A to  14 M  illustrate user interfaces of the personal broadcasting application according to one or more exemplary embodiments. 
     Referring to  FIG.  14 A , the first touch screen  12  displays a map area  630  provided by the personal broadcasting application. For example, the map area  630  may includes a geographical area of a predetermined scale including a current position of the user or a geographical area of a predetermined scale including a position selected by the user. The map area  630  includes at least one of caster indicators  634   a ,  634   b ,  634   c ,  634   d ,  634   e , and  634   f  indicating a position of at least one broadcaster. The caster indicators  634   a  to  634   f  are simple information on broadcast contents broadcasted by the broadcasters, and may include, for example, at least one of a captured image, a caster name, and a broadcast title. As a selectable embodiment, the first touch screen  12  displays a broadcasting category including the broadcast contents of the broadcaster displayed within the map area  630 , for example, at least one of all, lift, sports, and entertainment, and may further display a category display line  632  for a change to a desired broadcast category. 
     The second touch screen  14  displays broadcast lists  636  including at least some broadcast items  636   a ,  636   b ,  636   b ,  636   c ,  636   d , and  636   e  indicating broadcast contents provided by the broadcasters included in the map area  630 . Each of the broadcast items  636   a  to  636   e  includes a captured image of the broadcast contents, a broadcast title, a name of the broadcaster, broadcasting hours, and the number of views. 
     Referring to  FIG.  14 B , the portable device detects a touch gesture  640  in a predetermined direction, for example, a flick or a touch drag from the map area  630  displayed in the first touch screen  12 . Referring to  FIG.  14 C , the first touch screen  12  displays a map area  630  moved from the map area  630  according to a motion direction and a speed of the touch gesture  640 . Then, the second touch screen  14  displays the broadcast lists  636  including the broadcast items  636   e ,  636   f ,  636   g ,  636   h ,  636   i , and  636   h  of the broadcast contents provided by the caster indicators  634   a ,  634   b ,  634   d ,  634   e ,  634   g , and  634   h  included in the map area  630   a.    
     Referring to  FIG.  14 C , the second touch screen  14  detects a touch gesture  640   a  in a predetermined direction, for example, a flick in a vertical direction or a touch drag in a vertical direction from the displayed broadcast lists  636 . Then, the second touch screen  14  scrolls and displays the broadcast items of the broadcast lists  636  according to the touch gesture  640   a.    
     Referring to  FIG.  14 D , the portable device detects a predetermined touch gesture  640   b , for example, a tap gesture or a touch and hold from one (for example, the broadcast item  636   g  of the broadcast items of the broadcast lists  636  displayed in the second touch screen  14 . Then, as illustrated in  FIG.  14 E , the first touch screen  12  displays a broadcast image  636  reproducing broadcast contents corresponding to the broadcast item  636   g  and the second touch screen  14  displays discussion areas  642  and  644  in which viewers who view the broadcast image  638  can participate in response to the detection of the touch gesture  640   b . The discussion areas  642  and  644  include a message display window  642  and a message input window  644 , and the message input window  644  includes a message input area  644   a  and a message sending key  644   b . The message input area  644   a  receives a message including a text and/or a conversation icon from the user. When a tap gesture is detected from the message sending key  644   b  in a state where a message input into the message input area  644   a  exists, the message display window  644  displays the input message together with a name of the user (actual name or a nickname registered in the personal broadcasting application). 
     Referring to  FIG.  14 F , the portable device detects an input of one  646   a  of physical buttons arranged in the second panel including the second touch screen  14 , for example, an input  640   c  of the back button, that is, a tap gesture while the broadcasting image  638  is displayed in the first touch screen  12  and the discussion areas  642  and  644  are displayed in the second touch screen  14 . Then, as illustrated in  FIG.  14 G , the portable device replaces the broadcasting image  638  and the discussion areas  642  and  644  of the first and second touch screens  12  and  14  with the previously displayed map area  630   a  and broadcast lists  636  and displays the replaced map area  630   a  and broadcast lists  636  in response to the input  640   c.    
     When the user cannot find a desired broadcast through a movement of the map area  630   a  and a search for the broadcast lists  636 , the user can make a request for the desired broadcast to other users through a broadcast request function provided by the personal broadcasting application. Hereinafter, a scenario for making a request for the broadcast will be described. 
       FIGS.  14 G to  141    illustrate a user interface for a requester who makes a request for a desired broadcast through the personal broadcasting application. 
     Referring to  FIG.  14 G , the portable device displays the map area  630   a  and the broadcast lists  636  through the first and second touch screens  12  and  14  or detects an input of one  646   b  of the physical buttons arranged in the second panel including the second touch screen  14 , for example, an input  640   d  of the menu button, that is, a tap gesture while displaying the broadcasting image  638  and the discussion areas  642  and  644 . Then, in response to the input  640   d , a menu window  648  for the personal broadcasting application is displayed in the lower part of the second touch screen  14 . The menu window  648  includes at least one of a create broadcast key  648   a , a broadcast request key  648   b , a broadcast item search key  648   c , a broadcast item sorting key  648   d , and a setting key  648   e . When the portable device detects a predetermined touch gesture  640   e , for example, a tap gesture from the broadcast request key  648   b , the portable device proceeds to  FIG.  14 H . 
     Referring to  FIG.  14 H , in response to the detection of the tap gesture  640   e , on the second touch screen  14 , the broadcast request window  650  replaces the broadcast lists  636  or is displayed on the broadcast lists  636 . The broadcast request window  650  includes at least one of a message input area  650   a  for receiving a message for the broadcast request, a category selection area  650   b  for selecting a desired broadcast category, a completion key  650   c , and a cancel key  650   d . After the message for the broadcast request, for example, “Please show me B-boy events in A park” is input into the message input area  650   a  and the desired broadcast category is selected from the category selection area  650   b , the portable device detects a predetermined touch gesture  640   f , for example, a tap gesture from the completion key  650   c.    
     The personal broadcasting application transmits a broadcast request including the input information (request message and category) and selective additional information (name of the requester and current position of the requester) to users of other portable devices which are running the personal broadcasting application in response to the detection of the touch gesture  640   f . The broadcast request may be transmitted through a cellular network or a WiFi network. As a selectable embodiment, the broadcast request is transmitted to other users located within a predetermined range from a current position of the requester or a position designated by the requester. 
       FIGS.  141  to  14 M  illustrate a user interface for the user who receives the broadcast request through the personal broadcasting application. 
     Referring to  FIG.  14 I , the portable device receives a broadcast request of the requester through the personal broadcasting application and displays a request message window  654  including a request message of “Please show me B-boy events in A park” according to the broadcast request in the second touch screen  14  while the first touch screen  12  displays the map area  630   b  which can include at least one of caster indicators  652   a ,  652   b ,  652   c ,  652   d ,  652   e ,  652   f ,  652   g , and  652   h  and the second touch screen  12  displays broadcast lists related to the caster indicators  652   a  to  652   h . The request message window  654  further includes a view key  654   a  and a ignore key  654   b  together with the request message. As one embodiment, the request message window  654  may be displayed to overlap the broadcast lists displayed in the second touch screen  14  or the discussion areas displayed in the second touch screen  14 . As another embodiment, the request message window  654  may be displayed to overlap the map area  630   b  or the broadcast image displayed in the first touch screen  12 . 
     As a selectable embodiment, the personal broadcasting application receives the broadcast request, and inserts and displays a broadcast request indicator  652  indicating a position of the requester of the broadcast request on the map area  630   b  displayed in the first touch screen  12 . When a predetermined touch gesture, for example, a tap gesture or a touch and hold is detected from the broadcast request indicator  652 , the second touch screen  14  displays the request message window  654  according to the broadcast request. 
     The portable device detects a predetermined touch gesture  640   f , for example, a tap gesture from the view key  654   a  of the request message window  654  and proceeds to  FIG.  14 J . Referring to  FIG.  14 J , the second touch screen  14  displays broadcast request lists including a broadcast request item  656  according to the broadcast request in response to the detection of the touch gesture  640   f . The broadcast request item  656  includes a response key  656   a . The portable device detects a predetermined touch gesture  640   g , for example, a tap gesture from the response key  656   a  within the broadcast request item  656  and proceeds to  FIG.  14 K . As another embodiment, the request message window  654  of  FIG.  14 I  may further include the response key, and the first and second touch screens  12  and  14  may proceed to  FIG.  14 K  in response to the tap gesture detected from the response key within the request message window  654 . 
     Referring to  FIG.  14 K , the first and second touch screens  12  and  14  display first and second broadcast create windows  660  and  662 , respectively, in response to the detection of the touch gesture  640   g . As a selectable embodiment, the first and second broadcast create windows  660  and  662  may be located in one of the first and second touch screens  12  and  14 . 
     The first broadcast create window  660  displayed in the first touch screen  12  includes mode selection areas  660   a ,  660   b , and  660   c  for receiving one broadcast among a scene mode, a caster mode, and a mix mode. The second broadcast create window  662  displayed in the second touch screen  14  includes at least one of a title input window  662   a  for receiving a broadcast title, a category selection area  662   b  for selecting a broadcast category, a completion key  662   c , and a cancel key  662   d . Here, the view mode refers to a mode in which a scene image shot through the rear camera  26  of the portable device is broadcasted, the caster mode refers to a mode in which a caster image shot through the front camera  24  of the portable device is broadcasted, and the mix mode refers to a mode in which the caster image is combined with the scene image in a Picture In Picture (PIP) manner and then broadcasted. 
     After a broadcast mode, a broadcast title, and a broadcast category are input through the first and second broadcast create windows  660  and  662 , the portable device detects a predetermined touch gesture  640   h , for example, a tap gesture from the completion key  662   c . In response to the detection of the touch gesture  640   h , the personal broadcasting application operates at least one of the front camera  24  and the rear camera  26  according to a selected mode, collects an image shot by the at least one operated camera  24  or  26 , and carries a broadcast image generated through a combination of the collected images and broadcast service data including the input information (broadcast mode, broadcast title, and broadcast category) and selective additional information (name and current position of the caster) on a wireless signal according to a pre-designated transmission scheme and broadcasts the wireless signal. The broadcast service data may be transmitted through, for example, a cellular network or a WiFi network. 
     Referring to  FIG.  14 L , in response to the detection of the touch gesture  640   h , the portable device displays a broadcast image  664  shot by the at least one camera  24  or  26  and generated by the personal broadcasting application in the first touch screen  12  and displays discussion areas  666  and  668  in which a caster of the broadcast image  664  and viewers who view the broadcast image  664  can participate in the second touch screen  14 . The discussion areas  666  and  668  include a message display window  666  and a message input window  668 , and the message input window  668  includes a message input area  668   a  and a message sending key  668   b . The message input area  668   a  receives a message including a text and/or a conversation icon from the user. When a tap gesture is detected from the message sending key  668   b  in a state where a message input into the message input area  668   a  exists, the message display window  666  displays the input message together with a name of the user (an actual name or a nickname registered in the personal broadcasting application). 
     Although not illustrated, when the caster creates a broadcast, a caster indicator indicating the broadcast by the caster newly appears in the map area  630   a  of the requester and a broadcast item indicating the broadcast is included in the broadcast lists. When a tap gesture is detected from the broadcast item, the first and second touch screens of the requester display the broadcast area and discussion area of the broadcast by the caster. 
       FIG.  14 M  illustrates a request for and a response of a broadcast through the personal broadcasting application. As illustrated in  FIG.  14 M , a requester  670  can make a request for a desired broadcast to other users within a desired area by using the personal broadcasting application executed by a portable device  670   b  of the requester  670 . One of the other users is a caster  672  in response to the request, and the caster  672  creates and transmits the requested broadcast by using the personal broadcasting application executed by a portable device  672   b  of the caster  672 . A position indicator  670   a  of the requester  670  and a position indicator  672   a  of the caster  672  may be displayed in map areas displayed in the portable devices  670   b  and  672   b  of the requester  670  and the caster  672 . 
     When the portable device includes the display device including the first touch screen and the second touch screen arranged on at least one foldable panel and the first touch screen and the second touch screen are connected by the hinge or the flexible connector, the portable device can recognize motions of the first panel including the first touch screen and the second panel including the second touch screen as an input of a command. The motion includes, for example, folding back and folding hold. Here, the folding back includes bending of the flexible panel as well as folding of hard panels. 
     The folding back command refers to a user interface scheme of executing a predetermined function in the portable device by folding two panels within an effective angle range and then unfolding the two panels within an effective time. The folding hold command refers to a user interface scheme of executing a predetermined function in the portable device by folding two panels within an effective angle range and maintaining the two panels for an effective time. Hereinafter, the folding back command and the folding hold command will be described in detail with reference to the drawings. 
       FIG.  15    is a diagram for describing a detection of the folding back command according to an exemplary embodiment. 
       FIG.  15 A  illustrates a state before the folding back command is input into the portable device  100 , wherein a relative angle of the second panel  4  with respect to the first panel  2  is 180 degrees or close to 180 degrees within a predetermined range. Here, although it is illustrated that the relative angle θ is 180 degrees for the convenience, the relative angle can be any angle. As illustrated in  FIG.  15 B , the portable device  100  detects that the second panel  4  relatively moves such that the relative angle becomes a predetermined relative angle within an effective angle range Δα, for example, a range from 200 to 210 degrees (for example, 205 degrees). Further, as illustrated in  FIG.  15 C , the portable device  100  detects that the relative angle escapes from the effect angle range because the second panel  4  moves in a direction opposite to an entering direction of the effective angle range within an effective time (for example, one second). 
     The, the folding back command is input into the portable device  100  and the portable device  100  executes a function according to the folding back command. 
     As one embodiment, as long as the relative angle between the two panels  2  and  4  escapes from the effective angle range in the direction opposite to the entering direction within the effective time, the folding back command can be considered as being input. The second panel  4  does not need to return to an original position, that is, a state where the relative angle θ is 180 degrees (see  FIG.  15 A ), and the folding back command is input when the second panel  4  moves such that the relative angle θ becomes a random value smaller than 200 degrees. Further, although it has been described that the second panel  4  moves in the direction opposite to the entering direction and thus escapes from the effective angle range in  FIG.  15 C , even when the relative angle between the first panel  2  and the second panel  4  becomes a random value smaller than 200 degrees by moving the first panel in a bottom direction instead of moving the second panel  4  in the state of  FIG.  15 B , the folding back command can be input. That is, regardless of which panel moves, as long as the relative angle between the first panel  2  and the second panel  4  enters the effective angle range and escapes in the direction opposite to the entering direction, the folding back command is input. 
     Here, the effective angle range refers to a range of the relative angle between the two panels  2  and  4  preset by a manufacturer to recognize the folding back command, and the relative angle θ is not limited to an angle range of 10 degrees between 200 degrees and 210 degrees but may be set to have various ranges. Further, the effective angle range may be changed to an angle range designated by the user. That is, the portable device allows the user to directly change the effective angle range through an environment setting menu and thus to optimize the portable device in accordance with a utilization pattern of the user. 
     Further, the effective time refers to a time interval preset by the manufacturer to recognize the folding back command and is computed after a time point when the relative angle between the two panels  2  and  4  enters the effective angle range. Although it has been described that the effective time taken when the two panels  2  and  4  are unfolded after the two panels  2  and  4  are folded within the effective angle range is one second in the present embodiment, the effective time may be variously set to a value larger or smaller than one second. Similarly, the portable device may be implemented to set a time desired by the user as the effective time so that the portable device can be optimized in accordance with a utilization pattern of the user. 
     Although the folding back command has been described by using parameters such as the effective angle range and the effective time in the aforementioned embodiments, the present invention is not limited thereto and the portable device can input the folding back command without using the effective angle range in other embodiments. That is, when the relative angle between the two panels is changed by moving at least one panel of the two panels in a first direction and then the relative angle between the two panels is returned to the original angle (or an angle close to the original angle within a predetermined range) by moving at least one panel of the two panels in a second direction actually opposite to the first direction, the portable device may recognize that the folding back command is input. 
     The folding back command may be subdivided according to whether there is an additional input. As illustrated in  FIG.  15 B ′, when the relative angle enters the effective angle range Δα as the second panel  4  moves in the first direction and then a touch gesture of the user is detected from the first and/or second touch screen within an effective time or an additional input generated by pressing at least one of the physical buttons  5  and  5 ′ is detected and when the relative angle escapes from the effective angle range as the second panel  4  moves in the second direction opposite to the first direction, the portable device may recognize that a folding back command executing a different function from that of the aforementioned folding command is input. That is, the folding back command of folding and then unfolding the two panels  2  and  4  is divided into a folding back single command (in  FIGS.  15 A,  15 B, and  15 C ) having no additional input by the user within the effective time and a folding back combination command (in  FIGS.  15 A,  15 B ′, and  15 C) having an additional input (of touching the screen or pressing the physical button) by the user within the effective time. The portable device is implemented to execute different functions with respect to the folding back single command and the folding back combination command so as to execute the subdivided folding back commands. 
       FIG.  16    is a diagram for describing a detection of the folding hold command according to an exemplary embodiment. 
       FIG.  16 A  illustrates a state before the folding hold command is input into the portable device  100 , wherein a relative angle θ of the second panel  4  with respect to the first panel  2  is 180 degrees or close to 180 degrees within a predetermined range. Although it is illustrated herein that the relative angle θ is 180 degrees for convenience, the relative angle can be any angle. As illustrated in  FIG.  16 B , the portable device  100  detects that the second panel  4  relatively moves such that the relative angle θ becomes a predetermined relative angle within an effective angle range Δα, for example, a range from 200 to 210 degrees (for example, 205 degrees). Further, as illustrated in  FIG.  15 C , when the relative angle maintains an effective angle range for an effective time (for example, 0.5 seconds), the portable device  100  determines that the folding hold command is input and executes a function according to the folding hold command. 
     Here, the effective angle range and the effective time may be preset by the manufacturer or designated by the user as described above. 
     The folding hold command may be subdivided according to an existence or nonexistence of an additional input like the folding back command. As illustrated in  FIG.  16 B ′, when the second panel  4  moves such that the relative angle is within the effective angle range Δα and then a touch gesture of the user on the first and/or second touch screens is detected or an additional input of pressing at least one of the physical buttons  5  and  5 ′ is detected while the relative angle is maintained for an effective time, the portable device can recognize the detection as an input of a folding hold command for performing a function different from the aforementioned folding hold command. That is, the folding hold command in which the relative angle after the two panels  2  and  4  are folded is maintained within the effective angle range for the effective time is divided into a folding hold single command ( FIGS.  16 A,  16 B, and  16 C ) in which there is no additional input by the user within the effective time and a folding hold combination command ( FIGS.  16 A,  16 B ′, and  16 C) in which there is the additional input by the user within the effective time. The portable device is implemented to execute different functions with respect to the folding hold single command and the folding hold combination command so as to execute the subdivided folding hold commands. 
     The folding hold command may be implemented to execute a function of performing consecutive operations, for example, a zoom-in/out function, a quick play function, a rewind function and the like. In a case where a function by the folding hold command (single command or combination function) is executed, when the relative angle between the first panel  2  and the second panel  4  escapes from the effective angle range as illustrated in  FIG.  16 D , the function by the folding hold command is stopped. Here, the portable device can be implemented such that the executed function is stopped as long as the relative angle between the two panels escapes from the effective angle range in any direction regardless of the entering direction of the effective angle range. 
     When the portable device includes the display device including the first touch screen and the second touch screen arranged on one foldable panel and the first touch screen and the second touch screen are arranged on at least one foldable or bendable panel, the portable device can support a clipboard function by the folding back command input by the touch screen display device. Objects (text, image, sound and the like) cut or copied by a cut or copy command in the portable device are stored in an area called a clipboard. The clipboard stores the objects until a paste command from the clipboard is input or the objects area removed from the clipboard, and visually displays and provides the objects in response to a predetermined command. 
       FIGS.  17 A to  17 K  illustrate user interfaces for the clipboard function according to one or more exemplary embodiments. 
     Referring to  FIG.  17 A , a relative angle between the first panel  2  including the first touch screen  12  and the second panel  4  including the second touch screen  14  is actually 180 degrees (hereinafter, referred to as a first relative angle), the first touch screen  12  displays a first application  702 , and the second touch screen  14  displays a second application  704 . The first and second applications  702  and  704  may be any of the home screen, the application menu, the basic application, the application installed by the user. For example, the first and second applications  702  and  704  may be configured to display and input an object such as a text or image. In the shown example, the first application  702  is a message application such as a Short Messaging Service (SMS), an e-mail, or an Instant Messaging Service (IMS), and the second application  704  is an Internet browsing application. 
     Referring to  FIG.  17 B , as the second panel  4  relatively moves with respect to the first panel  2 , that is, moves in a first direction, the portable device recognizes that a relative angle between the first panel  2  and the second panel  4  is changed. As one example, as the second panel  4  rotates based on the hinge between the first panel  2  and the second panel  4 , the relative angle between the first panel  2  and the second panel  4  becomes an angle (hereinafter, referred to as a second relative angle) within a predetermined range exceeding 180 degrees. As the second panel  4  relatively rotates with respect to the first panel  2 , that is, in a second direction opposite to the first direction within a predetermined effective time after the relative angle between the first and second panels  2  and  4  becomes the second relative angle, the portable device detects that the relative angle between the first panel  2  and the second panel  4  becomes again the first relative angle (or actually becomes the first relative angle) and determines that a folding back command  700  is input. As described above, the folding back command  700  is detected when the first and second panels  2  and  4  including the first and second touch screens  12  and  14  are slightly folded outward and then unfolded back. 
     Referring to  FIG.  17 C , the portable device displays a clipboard  710  in a predetermined area of the first and/or second touch screen  12  and/or  14 , for example, a right part of the second touch screen  14  in response to the folding back command  700 . 
     The clipboard  710  is an area in which objects  710   a ,  710   b ,  710   c ,  710   d , and  710   e  cut or copied by a cut or copy command are stored and displayed, and a text, an image, and a sound which are the original of each the objects  710   a  to  710   e  are displays in a form of a simplified (or miniaturized) image or icon within the clipboard  710 . As one example, each of the objects  710   a  to  710   e  within the clipboard  710  may be displayed together with a date and time derived from the original. 
     Although not illustrated, when the folding back command is input again while the clipboard  710  is displayed, the second touch screen  14  can remove the clipboard  710 . Then, the original second application  704  is displayed again in the second touch screen  14 . 
     Referring to  FIG.  17 D , the portable device detects a touch gesture  700   a  moving from one object  706  among objects displayed by the first or second application  702  or  704  in the first or second touch screen  12  or  14 , that is, texts or images to one position (hereinafter, referred to as a first position) within the clipboard  710 , for example, a touch drag and proceeds to  FIG.  17 E . Referring to  FIG.  17 E , in response to the detection of the touch gesture  700   a , an object  710   f  which is a copy of the object  706  becomes included in the clipboard  710 . The clipboard  710  may be displayed in the first position in a symbol form of a simplified image or icon. As the object  710   f  newly enters the clipboard  710 , the objects displayed within the clipboard  710  may be rearranged together with the newly entered object  710   f.    
     Referring to  FIG.  17 F , the portable device detects a touch gesture  700   b  in a direction of the arranged objects  710   a ,  710   b ,  710   c ,  710   d , and  710   e  within the clipboard  710 , for example, a flick up/down or a touch drag up/down and displays the objects included in the clipboard  710  while scrolling the objects in a top direction or a bottom direction in response to the touch gesture  700   b.    
     Referring to  FIG.  17 G , the portable device detects a touch gesture  700   c  moving from one object  710   d  among the objects  710   c ,  710   f ,  710   d ,  710   e ,  710   g , and  710   h  displayed in the clipboard  710  to one position (hereinafter, referred to as a second position) of the first or second touch screen  12  or  14 , for example, a touch drag. In the shown example, the object  170   d  is an Internet address, that is, “http://mobile.nytimes.com” which is a text of the Uniform Resource Locator (URL) and is dragged to an address input window of the Internet browsing application  704  displayed in the second touch screen  14 . As illustrated in  FIG.  17 H , the Internet browsing application  704  receives a text of the object  710   d  as an Internet address according to the touch gesture  700   c  and displays a webpage  704   a  corresponding to the Internet address. 
     Referring to  FIG.  17 H , the portable device detects a touch gesture  700   d  heading for an outside of the clipboard  710  from a boundary between the application  704   a  and the clipboard  710  displayed in the second touch screen  14 , for example, a flick or a touch drag. As illustrated in  FIG.  17 I , the clipboard  710  is expanded within the second touch screen  14  according to the touch gesture  700   d . For example, the touch gesture  700   d  is a touch drag which starts at the boundary of the clipboard  710  and ends at one position (hereinafter, referred to as a third position) of the second touch screen  14  located in the outside of the clipboard  710 . Then, the expanded clipboard  712  has a horizontal length allowing the boundary thereof to meet the third position. As another example, the touch gesture  700   d  includes a flick starting at the boundary of the clipboard  710  and moving in a direction of the first touch screen  12  and the expanded clipboard  712  has a horizontal length predetermined within a range of the second touch screen  14 . As the clipboard  712  expanded by the touch gesture  700   d  spreads, the application  704   a  displayed in the second touch screen  14  may be partially or mostly hidden by the expanded clipboard  712 . 
     The expanded clipboard  712  can display more objects  712   b  in comparison with the original sized clipboard  710 . As a selectable embodiment, the expanded clipboard  712  may include a menu window  712   a  in which categories of the displayed objects, for example, all, text, image, and sound can be selected. The initially expanded clipboard  712  displays the objects  712   b  of all categories. When a tap gesture is detected from one category key within the menu window  712   a , only objects of the corresponding category are filtered and displayed. 
     Although not illustrated, when a touch gesture headed for an inside of the expanded clipboard  712  from the boundary between the application  704   a  and the expanded clipboard  712  displayed in the second touch screen  14 , for example, a flick or a touch drag is detected, the second touch screen  14  reduces the expanded clipboard  712  to the original sized clipboard  710  and displays the reduced clipboard  710 . 
     Also although not illustrated, when the folding back command is input while the expanded clipboard is  712  is displayed, the second touch screen  14  removes the expanded clipboard  712  without displaying the clipboard  712  anymore. Then, the original second application  704   a  is displayed again in the second touch screen  14 . 
     Referring to  FIG.  17 J , the portable device detects a touch gesture  700   e  moving from one object  712   c  among the objects  712   a  displayed in the expanded clipboard  712  to one position (hereinafter, referred to as a fourth position) of the first or second touch screen  12  or  14 , for example, a touch drag. In the shown example, the object  712   c  is a picture image and is dragged to the message application  702  displayed in the first touch screen  12  according to the touch gesture  700   e . As illustrated in  FIG.  17 K , the message application  702  receives a picture image  714   b  of the object  712   c  in response to a release of the touch gesture  700   e  and displays  702   a  a message sending input window  714  for sending the picture image  714   b  and a sending key  714   a  for executing the sending of the picture image  714   b  in the first touch screen  12 . When a tap gesture  700   f  is detected from the sending key  714   a , the message application  702  sends a message including the picture image to a recipient. 
     As a selectable embodiment, when a touch gesture headed for the inside of the clipboard  710  from the boundary of the clipboard  710 , for example, a flick or a touch drag reaching the opposite boundary of the clipboard  710  is detected while the clipboard  710  is displayed in the second touch screen  14 , the second touch screen  14  removes the clipboard  710 . In other words, the clipboard  710  which does not expand may be removed from the second touch screen  14  by the touch gesture or folding back command. 
     When the portable device includes the display device including the first touch screen and the second touch screen arranged on one foldable panel and the first touch screen and the second touch screen are arranged on at least one foldable or bendable panel, an electronic book function may be supported by the folding back command input by the touch screen display device. 
       FIGS.  18 A to  18 P  illustrate user interfaces for an electronic book function according to one or more exemplary embodiments. 
     Referring to  FIG.  18 A , a relative angle between the first panel  2  including the first touch screen  12  and the second panel  4  including the second touch screen  14  is actually 180 degrees (hereinafter, referred to as a first relative angle), the first touch screen  12  displays edge lines  802  of a first page  802   a  and previous pages provided by an electronic book application, and the second touch screen  14  displays edge lines  804  of a second page  804   a  and next pages provided by the electronic book application. The first and second page  802   a  and  804   a  include a text and/or an illustration of the same electronic book contents. 
     As one embodiment, the edge lines  802  and  804  may have different areas and intervals depending on amounts of the previous pages and the next pages. For example, when currently displayed pages correspond to 20 to 40% of the electronic book contents, the edge lines  802  of the previous pages are displayed as 1 cm and the edge lines  804  of the next pages are displayed as 2 cm. When the currently displayed pages correspond to 40 to 60% of the electronic book contents, the edge lines  802  of the previous pages are displayed as 1.5 cm and the edge lines  804  of the next pages are displayed as 1.5 cm. When the currently displayed pages correspond to 60 to 80% of the electronic book contents, the edge lines  802  of the previous pages are displayed as 2 cm and the edge lines  804  of the next pages are displayed as 1 cm. When the currently displayed pages correspond to 80 to 100% of the electronic book contents, the edge lines  802  of the previous pages are displayed as 2.5 cm and the edge lines  804  of the next pages are displayed as 0.5 cm. 
     As another embodiment, the edge lines  802  and  804  corresponding to the previous and next pages are hidden in a state where the first and second panels  2  and  4  are unfolded, and the corresponding edge lines  802  and  804  are displayed when one of the first and second panels  2  and  4  is slightly folded inward and then the folding state is maintained for a predetermined effective time. As one example, when the second panel  4  is slightly folded inward, for example, the second panel  4  is folded such that the relative angle becomes an angle equal to or larger than 180 degrees and smaller than 210 degrees, the second touch screen  14  displays the edge lines  804  in a right side of the displayed second page  804   a . When the second panel  4  is further folded, for example, when the second panel  4  is folded such that the relative angle becomes an angle equal to or larger than 210 degrees and smaller than 230 degrees, the edge lines  804  may be expansively displayed to have a wider area or interval in accordance with the relative angle. Similarly, when the first panel  2  is slightly folded inward, for example, the first panel  2  is folded such that the relative angle becomes an angle equal to or larger than 180 degrees and smaller than 210 degrees, the first touch screen  12  displays the edge lines  802  in a left side of the displayed first page  802   a . When the first panel  2  is further folded, for example, when the first panel  2  is folded such that the relative angle becomes an angle equal to or larger than 210 degrees and smaller than 230 degrees, the edge lines  802  may be expansively displayed to have a wider area or interval in accordance with the relative angle. As a selectable embodiment, when the first and second panels  2  and  4  are unfolded again, the edge lines  802  and  804  may be removed from the first and second touch screens  12  and  14 . 
     When the portable device detects a pre-designated touch gesture  800   a  heading for a direction of the first touch screen  12  from the second touch screen  14 , for example, a flick or a touch drag is detected, the portable device proceeds to  FIG.  18 B . 
     As illustrated in  FIG.  18 B , the first and second touch screens  12  and  14  replace the first and second pages  802   a  and  804  with succeeding third and fourth pages  802   b  and  804   b  and display the third and fourth pages  802   b  and  804   b  in response to the detection of the touch gesture  800   a . At this time, the third and fourth pages  802   b  and  804   b  may be displayed with a three dimensional graphic effect of turning the second page  804   a . After the second page  804   a  is turned, the edge lines  802  and  804  of the previous and next pages of the third and fourth pages  802   b  and  804   b  are still displayed. 
     Referring to  FIG.  18 B , as the second panel  4  relatively moves with respect to the first panel  2 , that is, in a first direction, the portable device detects that the relative angle between the first panel  2  and the second panel  4  is changed. As one example, as the second panel  4  rotates based on the hinge between the first panel  2  and the second panel  4 , the relative angle between the first angle  2  and the second angle  4  becomes an angle (hereinafter, referred to as a second relative angle) within a predetermined range (for example, 200 to 210 degrees) exceeding 180 degrees. As the second panel  4  relatively moves with respect to the first panel  2 , that is, in a second direction opposite to the first direction within a predetermined effective time after the relative angle between the first and second panels  2  and  4  becomes the second relative angle, the portable device detects that the relative angle between the first panel  2  and the second panel  4  becomes the first relative angle (or actual first relative angle) again and determines that a folding back command  800   b  is input. 
     Referring to  FIG.  18 C , the portable device displays tags  806  attached to at least some edge lines of the edge lines  804  of the next pages of the fourth page  804   b  displayed in the second touch screen  14  in response to the folding back command  800   b . Each of the tags  806  is located in an edge line of the page designated by the user or a provider of the electronic book contents, and the tags  806  may have different colors which are visually distinguished from the pages  802   b  and  804   b  and the edge lines  804 . As a selectable embodiment, each of the tags  806  may be attached to an edge line of the page including a memo or highlighted item designated by the user or the provider of electronic book contents. Although not illustrated, when a touch gesture for example, a tap gesture is detected from a first tag which is one of the tags  806 , the portable device executes a graphic effect of turning the pages and displays two pages including the page to which the first tag is attached in the first and second screens  12  and  14 . As a selectable embodiment, the tags  806  may be removed when the folding back command is input again. 
     Referring to  FIG.  18 D , the portable device detects a predetermined touch gesture  800   c , for example, a touch or a touch and hold from a first edge line  808  which is one of the edge lines  804  of the next pages of the fourth page  804   b  displayed in the second touch screen  14 . The second touch screen  14  changes a color of the first edge line  808  into a color (a first color, for example, red) visually distinguished from other edge lines in response to the detection of the touch  800   c . At this time, a page number of the first edge line  808 , for example, a page indicator  808   a  showing “P105” may be displayed on the first edge line  808 . 
     Referring to  FIG.  18 E , as the touch  800   c  moves in a direction of intersecting the edge lines  804  while being held, the touch  800   c  is released  800   d  at a second edge line  808   b  within the edge line area  804 . Accordingly, when the touch drag  800   c  or  800   d  reaching the second edge line  808   b  from the first edge line  808  is detected, the second touch screen  14  changes a color of the second edge line  808   b  into the first color. At this time, page number of the second edge line  808   b , for example, a page indicator  808   c  showing “P51” may be displayed on the second edge line  808   b.    
     Referring to  FIG.  18 F , the portable device detects that the touch  800   c  is released  800   d , and replaces the third and fourth pages  802   b  and  804   b  displayed in the first and second touch screens  12  and  14  with fifth and sixth pages  802   c  and  804   c  including the page of the second edge line  808   b  and displays the replaced fifth and sixth pages  802   c  and  804   c . At this time, the fifth and sixth pages  802   c  and  804   c  may be displayed with a graphic effect of successively turning pages between the third and fourth pages  802   b  and  804   b  and the fifth and sixth pages  802   c  and  804   c . Further, the edge lines  802  and  804  of previous and next pages of the fifth and sixth pages  802   c  and  804   c  are still displayed. 
     Referring to  FIG.  18 F , the second touch screen  14  can highlight a first item (text or illustration)  810  among items included in the sixth page  804   c  and display the highlighted first item  810 . The highlighted first item  810  may be designated by the user or the provider of the electronic book contents and displayed together with an indicator  810   a  showing a designated date/time. 
     Referring to  FIG.  18 G , the portable device detects a touch drag  800   e  moving along a second item  810   b  among items included in the sixth page  804   c  in the second touch screen  14 , and highlights the second item  810   b  with a designated color according to the touch drag  800   e  and displays the highlighted second item  810   b.    
     Referring to  FIG.  18 H , the portable device detects that the touch drag  800   e  is released and displays a menu bar  812  which is a soft menu for controlling a highlight function in a position where the touch drag  800   e  is released, that is, an end of the second item  810   b . For example, the menu bar  812  includes a highlight key  812   a  for selecting whether the highlight is performed or controlling the highlight, a color key  812   b  for changing a highlight color (or character), and a memo key  812   c  for attaching a memo. When a predetermined touch gesture  800   f , for example, tap gesture is detected from the memo key  812   c , the portable device proceeds to  FIG.  18 I . 
     Referring to  FIG.  18 I , the portable device displays a memo input window  814  in the second touch screen  14  in response to the detection of the touch gesture  800   f  on the memo key  812   c . For example, a memo input window  814  includes at least contents of the second item  810   b  selected by the touch drag  800   e  and allows an editing function by the user. When a tap gesture is detected from a done key included in the memo window  814 , the second touch screen  14  displays a memo window  814   a  including contents of the second item  810   b  input and edited by the memo input window  814  in a predetermined position as illustrated in  FIG.  18 J . The memo window  814   a  has a size smaller than the memo input window  814  and may include some of the contents input through the memo input window  814  or reduced contents and have a shape simplified from the memo input window  814 . Further, a tag having the same color as the highlight color of the corresponding second item  810   b  may be attached to the memo window  814   a . As a selectable embodiment, when the memo window  814   a  is displayed, a tag having the same color as that of the memo window  814   a  may be attached to an edge line of the page including the memo window  814   a.    
     Referring to  FIG.  18 K , the second touch screen  14  displays one or more memo windows  814   a  and  814   b  including items selected from the sixth page  804   c  by the user. Referring to  FIG.  18 K , in response to a touch drag  800   g  which starts at the memo window  814   b  and is released at an external position (first position) of the memo window  814   b  within the first and second touch screens  12  and  14 , the portable device can move the memo window  814   b  to the first position and then display the moved memo window in the first position. In the shown example, the first position is located within the first touch screen  12 . Similarly, referring to  FIG.  18 L , in response to a touch drag  800   h  headed for an external position (second position) of the memo window  814   a  from the memo window  814   a , the portable device can move the memo window  814   a  to the second position and display the moved memo window  814   a  in the second position. 
     Referring to  FIG.  18 M , as the second panel  4  relatively moves with respect to the first panel  2 , that is, in a first direction while the pages  802   c  and  804   c  are displayed in the first and second touch screens  12  and  14 , the portable device detects that the relative angle between the first panel  2  and the second panel  4  is changed. For example, as the second panel  4  rotates based on the hinge between the first panel  2  and the second panel  4 , the relative angle between the first panel  2  and the second panel  4  becomes an angle (hereinafter, referred to as a second relative angle) within a predetermined range (for example, 200 to 210 degrees) exceeding 180 degrees. When the relative angle between the first and second panels  2  and  4  becomes the second relative angle and the second relative angle remains for a predetermined effective time or more, the portable device determines that a folding hold command  800   i  is input. 
     The portable device displays a graphic effect  816  of successively turning pages from current pages  802   c  and  804   c  displayed in the first and second touch screens  12  and  14  to next pages, that is, a moving image in response to the folding hold command  800   i . Here, when each page is turned in a direction from the second touch screen  14  to the first touch screen  12 , the page may be displayed over both the first and second touch screens  12  and  14 . 
     Referring to  FIG.  18 N , as the second panel  4  relatively moves with respect to the first panel  2 , that is in a second direction opposite to the first direction, the portable device detects that the relative angle between the first panel  2  and the second panel  4  becomes again the first relative angle (or actual first relative angle) and determines that the folding hold command  800   i  is released and a folding back command  800   j  is input while the graphic effect  816  of successively turning the pages according to the folding hold command  800   i  is displayed. 
     Referring to  FIG.  18 O , the portable device ends the graphic effect  816  of turning the pages in response to the detection of the folding back command  800   j  and displays new pages  802   d  and  804   d  which have not been turned in the first and second touch screens  12  and  14 . The successive page turning function can be executed at different speeds depending on the relative angle between the first and second panels  2  and  4  while the folding hold command  800   i  is maintained. For example, a range of the relative angle is subdivided into four angle ranges, a 1× backward page turning function is executed when the second relative angle is within a first angle range, a 2× backward page turning function is executed when the second relative angle is within a second angle range, a 1× forward page turning function is executed when the second relative angle is within a third angle range, and a 2× forward page turning function is executed when the second relative angle is within a fourth angle range. 
     Referring to  FIG.  18 O , when the portable device detects a pre-designated touch gesture  800   k , for example, a touch and hold from a random position of the current pages  802   d  and  804   d  displayed in the first and second touch screens  12  and  14 , the portable device proceeds to  FIG.  18 D . 
     As illustrated in  FIG.  18 P , the portable device displays an electronic book setting menu  818  in a predetermined area within the first and second touch screens  12  and  14  in response to the detection of the touch gesture  800   k . As one example, the electronic book setting menu  818  may be displayed in a translucent state in upper parts of the current pages  802   d  and  804   d  and includes soft keys  818   a  for a font change, an index, and a text input and a chapter list  818   b.    
     As one example, the chapter list  818   b  includes a current chapter indicator  820  indicating chapter numbers and a current chapter position included in the electronic book contents. When a tap gesture  800   l  is detected from a first chapter number which is one of the chapter numbers of the chapter list  818   b , the portable device can display first pages (not shown) of a first chapter corresponding to the first chapter number in the first and second touch screens  12  and  14  in response to the detection of the tap gesture  800   l.    
     As another embodiment, the chapter list  818   b  does not require an input of a touch gesture and may be displayed in upper or lower parts of the first and second touch screens  12  and  14  all the time. 
     The portable device can support a video conference application in a separate work environment through the display device including the first touch screen and the second touch screen arranged on one foldable panel. Participants of the video conference can participate in the video conference through a connection of a group call. 
       FIGS.  19 A to  19 G  illustrate user interfaces of a video conference application according to one or more exemplary embodiments. 
     Referring to  FIG.  19 A , the first touch screen  12  displays at least one of a participant list area  802   a , a basic information area  902   b , a conference restart key  902   c , and a new conference create key  902   d  which are related to a first video conference among a plurality of video conferences which can be provided by a video conference application. The participant list area  802   a  includes names (or nicknames) of the participants including the user of the portable device and picture images (thumbnails). The basic information area  902   b  includes at least one of a conference date, for example, “Tuesday 16 Nov. 2010”, a conference start and end (expected) time, for example, “15:00” and “16:37”, and a name of a document file used for the conference, for example, “Dual Display.ppt”. When the first video conference is temporarily stopped, the conference restart key  902   c  is a soft key used to make a request for the restart of the first video conference to the participants or to inform the participants of the restart of the first video conference. The new conference create key  902   d  is a soft key used to create a new video conference. 
     The second touch screen  14  displays video conference lists  904  including at least some of conference items indicating video conferences which can be provided by the video conference application. Each of the conference items included in the video conference lists  904  include at least one of a title of the video conference, a start time, a host, a number of participants, and a progress time. In addition, the second touch screen  14  may further display at least one of a keypad key  904   a  for loading a virtual keypad, a favorites key  904   b  for selecting only frequently used video conferences, and a contact key  904   c  for loading contact numbers. Although not illustrated, when a tap gesture is detected from a conference item of a second video conference of conference items displayed in the second touch screen  14 , the portable device replaces information  902   a  ad  902   b  related to the first video conference displayed in the first touch screen  12  with information related to the second video conference and displays the replaced information. 
     When the portable device detects a predetermined touch gesture  900   a , for example, a tap gesture from the conference restart key  902   c  of the first touch screen  12 , the portable device proceeds to  FIG.  19 B . 
     Referring to  FIG.  19 B , the portable device displays a participant list area  906  expanded from the participant list area  902   a  of the first video conference in the first touch screen  12  and displays a shared board area  14  for the first video conference in the second touch screen  14  in response to the detection of the touch gesture  900   a . The participant list area  906  includes names (or nicknames) of the connected participants including the user him/herself, “ME” and picture images, and each of the picture images may have a larger size than the picture image within the participant list area  902   a . As a selectable embodiment, the participant list area  906  can provide more information on each of the participants in comparison with the participant list area  902   a.    
     In addition, the first touch screen  12  further displays at least one of a participant addition key  906   a  for adding a new participant, a microphone off key  906   b  for turning off a microphone, and a call end key  906   c  for ending or leaving from the video conference. The shared board area  908  displays contents of a document file, for example, “Atomic Structure.ppt” registered to be used for the first video conference according to a basic setting. The second touch screen  14  scrolls up/down the contents of the displayed document file in response to the detection of a touch gesture, for example, a flick up/down or a touch drag up/down on the shared board area  908 . In addition, the second touch screen  14  may further display a white board key  908   a  for selecting to use the shared board area  908  as the white board area. 
     When the portable device detects a predetermined touch gesture  900   b , for example, a tap gesture from the participant addition key  906   a  of the first touch screen  12 , the portable device proceeds to  FIG.  19 C . 
     Referring to  FIG.  19 C , the portable device displays a contact window  910  including person lists in the contact information who can participate in the first video conference in the first touch screen  12  in response to the detection of the touch gesture  900   b . The contact information window  910  includes person lists  910   a  including names of respective people and check boxes, an addition key  910   b , and a cancel key  910   c . When a check box of at least one person, for example, “Jae” within the person lists  910   a  is checked and a touch gesture  900   c , for example, a tap gesture is detected from the addition key  910 , the portable device proceeds to  FIG.  19 D . Referring to  FIG.  19 D , the portable device displays a participant list area  906   d  including a name and a picture image of “Jae” which is the person designated from the contact information window  910  as a new participant in the first touch screen  12  in response to the detection of the touch gesture  900   c.    
     When a predetermined touch gesture  900   d , for example, a tap gesture is detected from the white board key  908   a  displayed in the second touch screen  14 , the portable device proceeds to  FIG.  19 E . 
     Referring to  FIG.  19 E , the portable device replaces the document file displayed in the shared board area  908  of the second touch screen  14  with a white board area  912  in response to the detection of the touch gesture  900   d  and displays the replaced white board area  912 . The white board area  912  allows an input of a freehand drawing object by a touch of the user and displays freehand drawing objects  912   a ,  912   b , and  912   c  input by respective participants of the first video conference including the user. The freehand drawing objects  912   a ,  912   b , and  912   c  refer to graphic data in a form of a text or image input by the respective participants through the white board areas provided to the respective participants. 
     It is possible that each the freehand drawing objects  912   a ,  912   b , and  912   c  has different colors for each participant. During a display of the white board area  912 , a color indicator  912   f  indicating a color of the corresponding freehand drawing object  912   a ,  912   b , or  912   c  is displayed in each picture image included in the participant list area  906   d  of the first touch screen  12 . The color indicator of the participant who is inputting the freehand drawing object into the white board area  912  is displayed while flickering. In addition, the white board area  912  may include keys  912   d  and  912   e  for inputting and erasing the freehand drawing of the user. 
     During the display of the white board area  912 , the second touch screen  14  further displays a document file selection key  908   b  for displaying a document file in the shared board area. When a tap gesture is detected from the document file selection key  908   b , the second touch screen  14  replaces the white board area  912  with the document file and displays the replaced document file. 
     When the first touch screen  12  and the second touch screen  14  are arranged on at least one foldable or bendable panel, the portable device can support the video conference application in an out-folded screen mode. 
     Referring to  FIG.  19 F , as the first panel  2  including the first touch screen  12  relatively moves with respect to the second panel  4  while the video conference application is displayed in the first and second touch screens  12  and  14 , the portable device detects that the relative angle between the first panel  12  and the second panel  14  becomes an angle smaller than 180 degrees and determines that a fold-out command  900   e  is input. As one example, when the relative angle between the first panel  2  and the second panel  4  becomes an angle within a predetermined range (for example, 30 to 60 degrees) which is smaller than 180 degrees as the first panel  2  rotates based on the hinge between the first panel  2  and the second panel  4 , the portable device determines that the fold-out command  900   e  is input. 
     The portable device replaces information of the second touch screen  14  with a participant list area  906   e  and a shared board area  912   f  in response to the detection of the fold-out command  900   e  and displays the replaced participant list area  906   e  and shared board area  912   f . At this time, it is possible that the first touch screen  12  which has moved to the back is turned off. The participant list area  906   e  and the shared board area  912   f  have smaller sizes of those of the participant list area  906   d  and the shared board area  912  before the fold-out command  900   e . In addition, the second touch screen  14  further displays at least one of a participant list selection key  914   a  for expansively showing participant lists in the second touch screen  14 , a shared board selection key  914   b  for selecting whether to show the shared board area  912   f  in the second touch screen  14 , a microphone off key  914   c , and a call end key  914   d . The first touch screen  12  may be turned off in response to the fold-out command  900   e  or display information such as a clock according to an option which can be designated by the user. 
     When a tap gesture  900   f  is detected from the participant list selection key  914   a , the portable device proceeds to  FIG.  19 G . 
     Referring to  FIG.  19 G , the portable device expands the participant list area  906   f  in response to the detection of the touch gesture  900   f  and displays the expanded participant list area in the second touch screen  14 . The participant list area  906   f  includes picture images having a larger size than that of the participant list area  906   e  of  FIG.  19 F . In addition, the second touch screen  14  further displays at least one of the participant list selection key  914   a , the shared board selection key  914   b , the microphone off key  914   c , and the call end key  914   d.    
     Although not illustrated, when a tap gesture is detected from the shared board selection key  914   b , the portable device displays the shared board area including the document file of the white board area in the second touch screen  14  and displays simple participant lists together with the shared board area, for example, lists of only names without picture images or lists of smaller picture images and names. 
     The portable device can support an application requiring an interaction between two or more users, for example, a collaborative game application through the display device including the first touch screen and the second touch screen arranged on one foldable panel. The collaborative game application may be useful for an out-folded screen mode in which two touch screens are almost folded outwardly to face almost opposite directions. That is, the folded-out portable device is stood in a triangle shape, a front touch screen is used as a main touch screen for providing a user interface for a holder of the portable device, and a back touch screen is used as a sub touch screen shown to another user. That is, the back touch screen provides information to a holder of another portable device who executes the linked collaborative game application. 
       FIGS.  20 A to  20 H  illustrate user interfaces of the collaborative game application according to one or more exemplary embodiments. Here, a touch screen layout in a case where the portable device rotates by 90 degrees in a left direction is illustrated, wherein the first touch screen  12  located in a lower part before the fold-out becomes the main touch screen which provides a user interface for a user having the portable device, that is, the front touch screen, and the second touch screen  14  located in an upper part becomes the sub touch screen shown to other users, that is, the back touch screen. The above case also can be applied when the portable device rotates by 90 degrees in a right direction. 
     Referring to  FIG.  20 A , the first touch screen  12  displays a game ready screen  1002  provided by the collaborative game application, and the second touch screen  14  displays a guide phrase  1000  of making a request for turning off or folding-out the second touch screen  14 . As one embodiment, when the collaborative game application supporting the out-folded screen mode is executed in the portable device, the collaborative game application identifies whether the panels  2  and  4  including the first and second touch screens  12  and  14  are folded-out. When it is detected that the panels  2  and  4  are not folded-out, the collaborative game application displays the guide phrase  1000  making a request for folding-out the second touch screen  14 , for example, “Please fold the phone”. 
     The game ready screen  1002  displayed in the first touch screen  12  includes participant identification areas  1002   a ,  1002   b ,  1002   c , and  1002   d  for participants of the game including the user having the portable device and a ready key  1002   e  for selecting a game ready completion. Each of the participant identification areas  1002   a ,  1002   b ,  1002   c , and  1002   d  includes a picture image, a name (or nickname), or carried money of each participant. In one embodiment, the collaborative game application is a poker game application, and the game ready screen  1002  has a form embodied as a physical table on which the poker game is performed. Further, the first touch screen  12  may further display a chatting area  1004  including a chatting input window  1004   a  for the participants and potential participants. When a tap gesture is detected from the chatting input window  1004   a , the second touch screen  14  displays a virtual keypad in a predetermined area, for example, some of lower parts of the chatting area  1004  or second touch screen  14 . 
     When a predetermined touch gesture  1000   a , for example, a tap gesture is detected from the ready key  1002   e  of the first touch screen  12 , the portable device proceeds to  FIG.  20 B . 
     Referring to  FIG.  20 B , the portable device determines that the user becomes in a “Ready” state in response to the detection of the tap gesture  1000   a , displays a state indicator of “Ready” in the participant identification area  1002   a , and informs a portable device of another participant who is participating in the game that the user becomes in the “Ready” state by using a predetermined communication means. That is, the portable devices of all participants are mutually interworked by executing the poker game application, inform other participants of information generated from the poker game application of each participant, receive the information generated from the poker game application of another participant, and display the received information. When all the participants become in the “Ready” state, the portable device proceeds to  FIG.  20 C  to start one round of the poker game. 
     As illustrated in  FIG.  20 C , when one round of the poker game starts, the portable device displays a game interface screen  1006  for the user of the portable device in the first touch screen  12 . As one example, the game interface screen  1006  of the first touch screen  12  includes a chatting area  1006   a  receiving an input of a chatting message of the user and displaying chatting messages of other participants, a carried card area  1006   b  showing playing cards given to the user, a betting money area  1006   c  displaying money bet in the poker game of the current round, a carried money area  1006   d  displaying carried money of the user, and a card slot area  1006   e  displaying a card pool including closed cards which have not been provided to the participants. 
     Further, when one round of the poker game starts, the portable device displays game information  1008  for other participants in the second touch screen  14 . As one example, the game information  1008  for other participants displayed in the second touch screen  14  includes an identification area  1008   a  of the user, a betting display area  1008   b  displaying a betting item selected by the user, an open card area  1008   c  displaying cards selected to be shown to other users by the user, a carried money area  1008   d  displaying carried money of the user, and a card slot area  1008   e  displaying a card pool including closed cards which have not been provided to the participants. 
     As a selectable embodiment, when the portable device detects that the panels including the first and second touch screens  12  and  14  are folded outwardly (folded-out) while displaying the guide phrase  1002   a  making a request for folding-out the second touch screen  14  by the poker game application, the portable device displays the game information  1008  for other participants in the second touch screen  14 . That is, the guide phrase  1002   a  may be displayed in the second touch screen  14  until the fold-out is generated, and the game information  1008  may be displayed after the folding-out. 
     As another selectable embodiment, the poker game application activates the ready key  1002   e  only in a state where the panels of the portable device are folded-out. That is, the poker game application can start the poker game only in a fold-out state, and continuously displays the guide phrase  1002   a  in the second touch screen  14  until the second touch screen  14  is folded-out. 
       FIG.  20 D  is a perspective view of the portable device having folded-out panels. As illustrated in  FIG.  20 D , the portable device is stood in a triangle shape which is supported by two folded-out panels, wherein the game interface screen  1006  for the user having the portable device is displayed in the first touch screen  12  located in the front side and the game information  1008  for other participants is displayed in the second touch screen  14  located in the back side. Here, other participants refer to other users who execute the poker game application and have respective portable devices interworking with the portable device of the user.  FIG.  20 E  illustrates portable devices of participants which interwork with each other through the poker game application. As illustrated in  FIG.  20 E , the portable device of the user displays the game interface screen  1006  for the user through the first touch screen  12 . The portable devices for other participants also display game information for the corresponding participants through the front touch screen shown to the respective participants and displays game information  1014  for other participants through the opposite touch screen. 
     Referring to  FIG.  20 F , after one round of the poker game starts, the portable device sequentially withdraws the predetermined number of cards from the card slot area  1006   e  of the first touch screen  12  in a first turn of the user and arranges to expose front surfaces of the cards in a carried card area  1010   a . Simultaneously, the portable device sequentially withdraws the same number of cards from the card slot area  1008   e  of the second touch screen  14  and arranges to expose back surfaces of the cards in an open card area  1012   a . In addition, the first touch screen  12  can display stacked coins corresponding to currently bet money in an area  1010   b . When a predetermined touch gesture  1000   c , for example, a tap gesture or a flick up is detected from at least one of the cards arranged in the carried card area  1010   a , the portable device proceeds to  FIG.  20 G . 
     Referring to  FIG.  20 G , the portable device slightly moves the card selected by the touch gesture  1000   c  among the cards of which the front surfaces are exposed in the carried card area  1010   a  of the first touch screen  12  and simultaneously turns face-up and displays, that is, opens a card in a position corresponding to the selected card among the cards located in the open card area  1012   a  of the second touch screen  14 . When open cards are selected by all the participants, the portable device displays a betting command window  1010   c  through which betting items can be input into the first touch screen  12  when an order determined according to a rule of the poker is reached. The betting command window  1010   c  includes at least one of the betting items for the poker game, that is, “Check”, “Pin”, “Call”, “Raise”, “Half”, and “Fold”. At this time, the betting item which cannot be selected in the current order can be displayed in a deactivated state, that is, in a shadow. 
     When a predetermined touch gesture  1000   d , for example, a tap gesture is detected from one of the betting items of the betting command window  1010   c  displayed in the first touch screen  12 , for example, “Pin”, the portable device updates the game interface screen  1006  according to the betting item selected by the tap gesture  1000   d , displays the selected betting item of “Pin” in the betting display area  1008   b  of the second touch screen  14 , and informs the portable devices of other participants of the selected betting item at the same time. When the betting of all the participants is completed, the portable device withdraws a new card from the card slot area  1006   e  of the first touch screen  12 , displays to expose the front surface of the card in the card slot area  1006   e , withdraws a new card from the card slot area  1008   e  of the second touch screen  12 , and displays to expose the front surface of the card in the open card area  1012   a  at the same time, and then displays a betting command window  1010   c  in the first touch screen  12  when an order determined according to a rule of the poker game is reached similarly to  FIG.  20 F . 
       FIG.  20 H  illustrates screens when one round of the poker game ends. When one round of the poker game ends, the first touch screen  12  displays open states  1016   a  of all cards of the user and a game result  1016   b , for example, “Flush” and “Winner” and the second touch screen  14  displays open states  1018   a  of at least some of the cards given to the user and a game result  1018   b  at the same time. 
     The portable device can provide a more convenient user interface for a schedule management application through the display device including the first touch screen and the second touch screen arranged on one foldable panel. An example of the application for the schedule management may include a calendar application. 
       FIGS.  21 A to  21 O  include user interfaces of the schedule management application according to one or more exemplary embodiments. 
     Referring to  FIG.  21 A , the first touch screen  12  displays a view mode selection area  1102  for selecting a schedule view mode and a calendar area  1102   a  of a month mode. The schedule management application selects a schedule view mode through a month mode key, a week mode key, a day mode key, and a list mode key included in the view mode selection area  1102 . As one embodiment, the schedule management application displays the calendar area  1102   a  in a month mode, that is, dates of a current month including a today&#39;s date by default when the schedule management application starts. The calendar area  1102   a  of the month mode includes day blocks corresponding to dates included in the selected month and may include some of the day blocks of a previous month and a next month. For example, the day blocks form a row corresponding to a week and a column corresponding to a day. A day block corresponding to today&#39;s date among the day blocks may be displayed with a predetermined color which is visually distinguished. A date indicator  1106   a  indicating a date selected by the user is disposed in one of the day blocks and may be, for example, a rectangular form in a bold line surrounding a number of the selected date. When the calendar application starts, the date indicator  1106   a  is displayed in the day block of the today&#39;s date. 
     The second touch screen  14  can display another application or information on the schedule management program according to a setting of a schedule management program or a selection by the user while the first touch screen  12  displays the calendar area of a month mode, a week mode, a day mode, or a list mode.  FIG.  21 A  illustrates an example of displaying information provided by the schedule management program in the second touch screen  14 . 
     Referring to  FIG.  21 A , the second touch screen  14  displays event lists  1104   a  including registered event items of the selected date of the calendar area  1102   a . Each of the event items may indicate an event registered in a selected date or an event registered in a period including the selected date. As another embodiment, the event lists  1104   a  of the second touch screen  14  may include event items registered in a month of the calendar area  1102   a . Each of the event items includes at least one of an event title, an event date(s), an event time, and an event related image icon. Further, the first or second touch screen  12  or  14  displays a new event create key  1104  for registering a new event in a predetermined position. For example, the new event create key  1104  is disposed in a lower part of the event lists  1104   a  of the second touch screen  14 . 
     When a predetermined touch gesture  1100   a , for example, a tap gesture is detected from one date of the calendar area  1102  of the first touch screen  12 , for example, “16”, the portable device proceeds to  FIG.  21 B . 
     Referring to  FIG.  21 B , the portable device places a date indicator  1106   b  on the date selected by the touch gesture  1100   a  within the calendar area  1102   a  of the first touch screen  12  in response to the detection of the tap gesture  1100   a  and displays the event lists  1104   b  including the registered event items of the selected date in the second touch screen  14 . 
     When a selection of a menu button which is one of the physical buttons disposed in a lower part of the first touch screen  12 , for example, a touch gesture  1100   b  is detected while the calendar area  1102   a  is displayed in the first touch screen  12 , the portable device displays a first menu window  1104   c  in the lower part of the first touch screen  12  in response to the detection of the touch gesture  1100   b . The first menu window  1104   c  includes at least one of a create key for creating a new event, a go to key for moving to a selected date, a today key for moving to today&#39;s date, a search key for searching for a desired event, a deletion key for deleting a registered event, and a setting key for changing a setting of the schedule management application. The first menu window  1104   c  may be loaded by a touch of the menu button while the calendar area of the month mode, the week mode, the day mode, or the list mode is displayed in the first touch screen  12 . 
     When the menu button which is one of the physical buttons disposed in the lower part of the second touch screen  14  is selected, for example, when a touch gesture  1100   d  is detected while the event lists  1104   b  are displayed in the second touch screen  12 , the portable device displays a second menu window  1104   d  in the lower part of the second touch screen  14  in response to the detection of the touch gesture  1100   c . The second menu window  1104   d  includes at least one of a search key for searching for a desired event and a deletion key for deleting a registered event. The second menu window  1104   d  may be loaded by a touch of the menu button while the event lists are displayed in the second touch screen  140   
     When a tap gesture  1100   d  is detected from a main mode key included in the view mode selection area  1102  of the first touch screen  12 , the portable device proceeds to  FIG.  21 C . 
     Referring to  FIG.  21 C , the portable device displays a calendar area  1102   c  of the week mode including the today&#39;s date (or a selected date) in the first touch screen and displays event lists  1104   e  including event items registered in the selected date of the calendar area  1102   c  or week of the calendar area  1102   c  in the second touch screen  14  in response to the detection of the tap gesture  1100   d . The calendar area  1102   c  of the week mode includes a week display line indicating a selected week, for example, “3rd week January, 2009”, dates of the selected week, for example, S11, M12, T13, W14, T15, F16, and S17, and hour blocks indicating a schedule for each hour of each date. That is, the calendar area  1102   c  of the week mode includes columns corresponding to the day and rows corresponding to the hour. A first letter of each date refers to the day. Each of the hour blocks may be displayed with a predetermined color when there is an event registered in the corresponding hour. 
     When a tap gesture  1100   e  is detected from the day mode key included in the view mode selection area  1102  of the first touch screen  12 , the portable device proceeds to  FIG.  21 D . 
     Referring to  FIG.  21 D , the portable device displays a calendar area  1102   d  of the day mode including the today&#39;s date (or a selected date) in the first touch screen  12  and displays event lists  1104   f  including event items registered in the date of the calendar area  1102   d  in the second touch screen  14  in response to the detection of the tap gesture  1100   e . The calendar area  1102   d  of the day mode includes a date display line indicating the selected date, for example, “Thu,  1 / 13 / 2009 ” and an hour line for each hour on the selected date. When there is an event registered in the corresponding hour, each of the hour lines includes an event tile of the corresponding event and may be displayed with a predetermined color. 
     When a predetermined touch gesture  1100   f , for example, a tap gesture is detected from one event item of the event lists  1104   f  of the second touch screen  14 , the portable device proceeds to  FIG.  21 E . 
     Referring to  FIG.  21 E , the portable device replaces the calendar area  1102   d  of the first touch screen  12  with event lists  1104   g  including an event item selected by the tap gesture  1100   f  and displays the replaced event lists  1104   g , and displays detailed information  1108  on the event item selected from the event lists  1104   g  in the second touch screen  14  in response to the detection of the tap gesture  1100   f . The detailed information  1108  includes at least one of an event title and date  1108   a , the remaining days to the event  1108   b , a registered image  1108   c  of the event item, and participant lists  1108   d  related to the event item. The first touch screen  12  can dispose the new event create key  1104  in a lower part of the event lists  104   g  while the event lists  1104   g  are displayed in the first touch screen  12 . 
     Referring to  FIG.  21 F , a tap gesture  1100   g  is detected from the list mode key included in the view mode selection area  1102  of the first touch screen  12 , and a calendar area  1102   e  listing all the registered event items including the event item registered in the selected date (or today&#39;s date) is displayed in the first touch screen  12  and detailed information  1108   e ,  1108   f ,  1108   g , and  1108   h  of the event item selected from the calendar area  1102   e  are displayed in the second touch screen  14  in response to the tap gesture  1100   g . As one embodiment, the calendar area  1102   e  of the list mode includes event lines corresponding to the event items, and each of the event lines may include an event title and event hour. 
     When a touch gesture  1100   h  is detected from the menu button disposed in the lower part of the first touch screen  12  while the calendar area  1102   a  of the list mode is displayed in the first touch screen  12 , the portable device displays the first menu window  1104   c  in the lower part of the first touch screen  12  in response to the detection of the touch gesture  1100   h.    
     As the event item is selected from the event lists  1104   g  displayed in the first touch screen  12  or the list mode key within the view mode selection area  1102  is selected, when a touch gesture  1100   i  is detected from the menu button disposed in the lower part of the second touch screen  14  while the detailed information  1108   a  to  1108   h  of the selected event item are displayed in the second touch screen  14 , the portable device displays a third menu window  1104   g  in the lower part of the second touch screen  14  in response to the detection of the touch gesture  1100   i . The third menu window  1104   g  includes at least one of an editing key for editing a selected event item, a deletion key for deleting a selected event item, a sending key for sending a selected event item to a desired recipient, a search key for searching for a desired event item, a participant sending key for sending a selected event item to the participants, and a export key for sending a selected event item to a plurality of recipients. 
     As a selectable embodiment, when the schedule management application starts, the second touch screen  14  can display another application, for example, a home screen, an application menu, or a previously executed other application. It is referred to as a schedule management application operating in a multi mode. 
     Although not illustrated, when the portable device is in a landscape view mode, a lower touch screen can display the calendar area of the month mode, the week mode, the day mode, or the list mode provided by the schedule management application and an upper touch screen can display an event list related to the selected date of the calendar area or detailed information on the selected event item. As a selectable embodiment, when the portable device is in the landscape view mode, the upper touch screen can display the calendar area of the month mode, the week mode, the day mode, or the list mode provided by the schedule management application and the lower touch screen can display information on another application. 
       FIGS.  21 G to  211    illustrate a scenario for generating a new event in the schedule management application according to an exemplary embodiment. 
     Referring to  FIG.  21 G , the portable device displays the view mode selection area  1102  and the calendar area  1102   a  in the first touch screen  12  and displays the event lists  1104   a  of the selected data of the calendar area  1102   a  and the new event create key  1104  in the second touch screen  14 . Although the calendar area  1102   a  of the month mode is illustrated herein, a new event can be generated in a similar way when the calendar area corresponds to a calendar area  1102   c ,  1102   d , or  1102   e  of the week mode, the day mode, or the list mode. The portable device can detect a create command of a new event through the first or second touch screen  12  or  14  or the menu button in the lower part of the first touch screen  12 . For example, when a touch and hold  1100   j - 1  is detected from a particular date of the calendar area  1102   a  of the first touch screen  12 , a tap gesture  1100   j - 2  is detected from the new event create key  1104  of the second touch screen  14 , or a tap gesture  1100   j - 4  is generated from the create key within the first menu window  1104   c  loaded by selecting a menu button  1100   j - 3 , the portable device recognizes the detection as a create command of the new event and proceeds to  FIG.  21 H . 
     Referring to  FIG.  21 H , the portable device replaces the view mode selection area  1102  of the first and second touch screens  12  and  14 , the calendar area  1102   a , the event lists  1104   a , and the new event create key  1104  with first and second event create windows  1110   a  and  1110   b  for receiving event elements of the new event and displays the replaced first and second event create windows  1110   a  and  1110   b  in response to the create commands  1100   j - 1 ,  1100   j - 2 , and  1100   j - 4  of the new event. The first event create window  1110   a  displayed in the first touch screen  12  includes an event title input area, a start date selection area, an end date input area, and an all day selection area. The second event create window  1110   b  displayed in the second touch screen  14  includes at least one of a position input area related to the event, a participant input area, an alarm selection area, a repetition selection area, and an explanation input area. Each of the event create windows  1110   a  and  1110   b  may be scrolled in response to the detection of a flick up/down or a touch drag up/down within the corresponding window. 
     When a tap gesture is detected from at least one of the input areas, a virtual keypad is displayed in a predetermined area of the touch screen selected by the corresponding tap gesture. For example, when a tap gesture is detected from the event title input area displayed in the first touch screen  12 , the first touch screen  12  displays a virtual keypad in a lower half part of the first touch screen  12  and receives an event title through the virtual keypad. As a selectable embodiment, when a tap gesture is detected from one of the input areas, one virtual keypad is displayed in lower parts of both the first and second touch screens  12  and  14 .
         /**ppt #13, 11. Text Input**/       

     Although not illustrated, when the portable device is in the landscape view mode, the upper touch screen can display the first event create window  1110   a  and the lower touch screen can display the second event create window  1110   b . As one embodiment, when a tap gesture is detected from one of the input areas included in the upper touch screen, the virtual keypad is displayed in at least a part of the lower touch screen (lower half part or whole lower part). As one embodiment, when a tap gesture is detected from one of the input areas included in the lower touch screen, the virtual keypad is displayed in at least a part of the lower touch screen (for example, lower half part). As one embodiment, when a tap gesture is detected from one of the input areas included in the lower touch screen, the second event create window  1110   b  is displayed in the upper touch screen and the virtual keypad is displayed in the whole lower touch screen. 
       FIG.  21 I  illustrates another example of first and second event create windows  1110   c  and  1110   d  displayed when a touch and hold  1100   j - 1  is detected from a particular date of the calendar area  1102   a  of the first touch screen  12 . As illustrated in  FIG.  21 I , a date in a position where the touch and hold  1100   j - 1  is detected may be automatically input into the start date selection area and the end date selection area of the first event create window  1110   c . As a selectable embodiment, when the touch and hold  1100   j - 1  is generated in a time line of the calendar area  1102   d  of the day mode, a start time and/or an end time may be automatically input into the first event create window  1110   c.    
       FIGS.  21 J to  21 L  illustrate a scenario for deleting an event registered in the schedule management application according to an exemplary embodiment. 
     Referring to  FIG.  21 J , the portable device displays the view mode selection area  1102  and the calendar area  1102   a  in the first touch screen  12  and displays the event lists  1104   a  of the date selected from the calendar area  1102   a  of the second touch screen  14  and the new event create key  1104  in the second touch screen  14 . Although the calendar area  1102   a  of the month mode is illustrated herein, the event can be deleted in a similar way to that when the calendar area corresponds to the calendar area  1102   c ,  1102   d , or  1102   e  of the week mode, the day mode, or the list mode. The portable device can detect a deletion command of the event through the first or second touch screen  12  or  14  or the physical button (menu button) in the lower part of the first touch screen  12 . For example, when a tap gesture  1120   a  is detected from the deletion key within the first menu window  1104   c  loaded by selecting the menu button  1120 , the portable device recognizes the detection as a deletion command of the registered event and proceeds to  FIG.  21 K . 
     Referring to  FIG.  21 K , the portable device replaces the view mode selection area  1102  and the calendar area  1102   a  of the first touch screen  12  with an event deletion window  1112   a  and a deletion key  1112   b  for executing the deletion command and displays the replaced event deletion window  1112   a  and deletion key  1112   b  in response to the deletion command  1120   a . The event deletion window  1112   a  lists event deletion items corresponding to events registered in the month of the calendar area  1102   a  displayed in the first touch screen  12 . Each of the event deletion items includes an event name of each registered event and a check box, and an input of selecting the event item to be deleted is detected through the check box. When the calendar area  1102   a  of the month mode is displayed in the first touch screen  12 , the event deletion window  1112   a  includes events registered in the month of the calendar area  1102   a . Similarly, when the calendar area  1102   c ,  1102   d , or  1102   e  of the week mode, the day mode, or the list mode is displayed in the first touch screen  12 , the event deletion window  1112   a  includes events registered in the corresponding week, day, or list. 
     The second touch screen  14  may be in a deactivated state while the event deletion window  1112   a  is displayed in the first touch screen  12 . In the deactivated state, the second touch screen  14  is filled with a shadow and does not respond to the touch gesture. 
     When a tap gesture  1120   b  is detected from at least one check box of the event deletion events of the first touch screen  12  and a tap gesture  1120   c  is detected from the deletion key  1112   b , the portable device proceeds to  FIG.  21 L . 
     Referring to  FIG.  21 L , the portable device replaces the event deletion window  1112   a  and the deletion key  1112   b  of the first touch screen  12  with previous information, that is, the view mode selection area  1102  and the calendar area  1102   a  and displays the replaced view mode selection area  1102  and calendar area  1102   a  in response to the detection of the tap gesture  1120   c . When the event deletion window  1112   a  is removed from the first touch screen  12 , the second touch screen  14  escapes from the deactivated state and event lists  1104   h  including registered events except for the event item selected from the event deletion window  1112   a  by the tap gesture  1102   b  are displayed. 
       FIGS.  21 M to  21 O  illustrate another scenario for deleting an event registered in the schedule management application. 
     Referring to  FIG.  21 M , the portable device displays the view mode selection area  1102  and the calendar area  1102   c  in the first touch screen  12  and displays the event lists  1104   a  of the date selected from the calendar area  1102   a  and the new event create key  1104  in the second touch screen  14 . Although the calendar area  1102   a  of the month mode is illustrated herein, the event can be deleted in a similar way to that when the calendar area corresponds to the calendar area  1102   c ,  1102   d , or  1102   e  of the week mode, the day mode, or the list mode. When a tap gesture  1120   e  is detected from the deletion key within the second menu window  1104   d  loaded by selecting the menu button  1120   d  in the lower part of the second touch screen  14 , the portable device recognizes the detection as a deletion command of the registered event and proceeds to  FIG.  21 N . 
     Referring to  FIG.  21 N , the portable device replaces the event lists  1104   a  and the new event create key  1104  of the second touch screen  14  with an event deletion window  1112   c  and a deletion key  1112   d  for executing the deletion command and displays the replaced event deletion window  1112   c  and deletion key  1112   d  in response to the deletion command  1120   e . The event deletion window  1112   c  lists events registered in the event lists  1104   a  displayed in the second touch screen  14 , that is, event deletion items corresponding to the events registered in the selected date of the first touch screen  12 . Each of the event deletion items includes an event name of each registered event and a check box, and an input of selecting the event item to be deleted is detected through the check box. The first touch screen  12  may be in a deactivated state while the event deletion window  1112   c  is displayed in the second touch screen  14 . In the deactivated state, the first touch screen  12  may be filled with a shadow and does not respond to the touch gesture. 
     When a tap gesture  1120   f  is detected from at least one check box of the event deletion events of the second touch screen  14  and a tap gesture  1120   g  is detected from the deletion key  1112   d , the portable device proceeds to  FIG.  21 O . 
     Referring to  FIG.  21 O , the portable device replaces the event deletion window  1112   c  and the deletion key  1112   d  of the second touch screen  14  with event lists  1104   i  and the new event create key  1104  and displays the replaced event lists  1104   i  and new event create key  1104  in response to the detection of the tap gesture  1120   g . The event lists  1104   i  includes registered events except for the event item selected from the event deletion window  1112   c  by the tap gesture  1120   f  in comparison with the previous event lists  1104   a . When the event deletion window  1112   c  is removed from the second touch screen  14 , the first touch screen  12  escapes from the deactivated state. 
       FIGS.  22 A to  22 M  illustrate scenarios of expanding the calendar area in the schedule management application and displaying the expanded calendar area according to one or more exemplary embodiments. 
     Referring to  FIG.  22 A , the portable device displays a view mode selection area  1202  and a calendar area  1202   a  in the first touch screen  12  and displays event lists  1206   a  of a date  1204   a  selected from a calendar area  1202   a  and a new event create key  1206  in the second touch screen  14 . Although the expansion of the calendar area  1202   a  of the month mode is illustrated herein, the calendar area  1102   c ,  1102   d , or  1102   e  of the week mode, the day mode, or the list mode can be expanded in a similar way. The portable device detects a touch gesture  1200   a  of expanding an area selected from the calendar area  1202   a , that is, a pinch zoom-in. As another embodiment, the touch gesture  1200   a  includes two touch drags which are generated at the same time and move away from each other in approximately opposite directions. The touch gesture  1200   a  starts at two positions within the calendar area  1202   a , and one of the two touch drags may end at the second touch screen  14 . At least one touch included in the touch gesture  1200   a  passes through the hinge between the two touch screens  12  and  14 . 
     As another embodiment, the portable device can detect a zoom-in command through the menu button in the lower part of the first touch screen  12 . That is, when the menu button which is one of the physical buttons located in the lower part of the first touch screen  12  is selected, for example, when a touch gesture  1200   b  is detected, the portable device displays a first menu window  1202   b  in the lower part of the first touch screen  12  in response to the detection of the touch gesture  1200   b . The first menu window  1202   b  includes at least one of a create key for creating a new event, a go to key for moving to a selected date, a today key for moving to the today&#39;s date, a dual zoom key for expanding a displayed calendar area, a search key for searching for a desired event, a deletion key for deleting a registered event, and a setting key for changing a setting of the schedule management application. The first menu window  1202   b  including the dual zoom key may be loaded by a touch of the menu button while the calendar area of the month mode or the week mode is displayed in the first touch screen  12 . 
     When the portable device detects a touch gesture  1200   c , that is, a tap gesture from the dual zoom key within the first menu window  1202   b  loaded by selecting the menu button  1200   b  in the lower part of the first touch screen  12 , the portable device proceeds to  FIG.  22 B . 
     Referring to  FIG.  22 B , in response to the detection of the pinch zoom-in  1200   a  on the calendar area  1202   a  or the tap gesture  1200   c  on the dual zoom key, the portable device displays first and second calendar areas  1208   a  and  1208   b  expanded from the calendar area  1202   a  in the first and second touch screens  12  and  14 . The first and second calendar areas  1208   a  and  1208   b  include larger day blocks than the calendar area  1202   a  before the expansion and display more information in comparison with the events registered in each day block. The first calendar area  1208   a  includes some of the day blocks corresponding to the month of the calendar area  1202   a , and the second calendar area  1208   b  includes the remainders of the day blocks corresponding to the month of the calendar area  1202   a . The new event create key  1206  may be disposed in an upper part of the second calendar area  1208   b  in the second touch screen  14  in order to successively dispose the first and second calendar areas  1208   a  and  1208   b . The day block  1204   b  located in the today&#39;s date in the first and second calendar areas  1208   a  and  1208   b  may be displayed with a predetermined color which is visually distinguished. 
     As a selectable embodiment, detailed information on the date selected from the month areas  1208   a  and  1208   b  may be displayed in a form of a popup window while the first and second month areas  1208   a  and  1208   b  are displayed in the first and second touch screens  12  and  14 . 
     The portable device detects a touch gesture  1200   d  of reducing the area selected from the first and second month areas  1208   a  and  1208   b , that is, pinch zoom-out and returns to  FIG.  22 A . As another embodiment, the touch gesture  1200   d  includes two touch drags which are simultaneously generated and approach each other. The touch gesture  1200   d  may start at each of different touch screens  12  and  14  and end at one of the first and second touch screens  12  and  14 . At least one touch included in the touch gesture  1200   d  passes through the hinge between the two touch screens  12  and  14 . 
     Referring to  FIG.  22 C , the portable device displays a view mode selection area  1202  and a calendar area  1202   c  of the week mode in the first touch screen  12  and displays event lists  1206   b  of the date selected from the calendar area  1202   c  and the new event create key  1206  in the second touch screen  14 . The portable device recognizes a touch gesture  1200   e  of expanding the area selected from the calendar area  1202   c , that is, pinch zoom-in. As another embodiment, the touch gesture  1200   e  includes two touch drags which are simultaneously generated and move away from each other in approximately opposite directions. The touch gesture  1200   e  may start at two positions within the calendar area  1202   a  and one of the two touch drags may end at the second touch screen  14 . At least one touch included in the touch gesture  1200   e  passes through the hinge between the two touch screens  12  and  14 . Although not illustrated, the portable device can detect a zoom-in command of the calendar area  1202   c  of the week mode through the menu button in the lower part of the first touch screen  12 . 
     Referring to  FIG.  22 D , the portable device detects a tap gesture from the dual zoom key within the first menu window loaded by selecting the menu button in the lower part of the first touch screen  12  or detects the pinch zoom-in on the calendar area  1202   c , and displays the first and second calendar areas  1208   c  and  1208   d  expanded from the calendar area  1202   c  in the first and second touch screens  12  and  14 . The first and second calendar areas  1208   c  and  1208   d  include larger hour blocks in comparison with the calendar area  1202   c  before the expansion and display more information on the event registered in each of the hour blocks. The first calendar area  1208   c  includes hour blocks of some of the dates corresponding to the week of the calendar area  1202   c , and the second calendar area  1208   d  includes hour blocks of the remainders of the dates corresponding to the week of the calendar area  1202   c . The new event create key  1206  may be disposed in an upper part of the second calendar area  1208   d  in the second touch screen  14  in order to successively dispose the first and second calendar areas  1208   c  and  1208   d.    
     As a selectable embodiment, detailed information on the date selected from the calendar areas  1208   c  and  1208   d  may be displayed in a form of a popup window while the first and second calendar areas  1208   c  and  1208   d  are displayed in the first and second touch screens  12  and  14 . 
     The portable device detects a touch gesture  1200   f  of reducing the area selected from the first and second calendar areas  1208   c  and  1208   d , that is, pinch zoom-out and returns to  FIG.  22 C . As another embodiment, the touch gesture  1200   f  includes two touch drags which are simultaneously generated and approach each other. The touch gesture  1200   f  may start at each of the different touch screens  12  and  14  and end at one of the first and second touch screens  12  and  14 . As one embodiment, the calendar area reduced by the touch gesture  1200   f  may be displayed in one touch screen where the touch gesture  1200   f  ends. At least one touch included in the touch gesture  1200   f  passes through the hinge between the two touch screens  12  and  14 . 
     A scenario in the calendar area expanded to occupy the first and second touch screens  12  and  14  will be described with reference to  FIGS.  22 E to  22 G . 
     Referring to  FIG.  22 E , the portable device displays the first and second calendar areas  1208   a  and  1208   b  including day blocks corresponding to one month in the first and second touch screens  12  and  14 , respectively. The first calendar area  1208   a  includes some of the day blocks corresponding to the selected month, and the second calendar area  1208   b  includes the remainders of the day blocks. When a predetermined touch gesture  1200   g , for example, a tap gesture or a touch and hold is detected from one  1204   c  of the day blocks included in the first and second calendar areas  1208   a  and  1208   b , the portable device proceeds to  FIG.  22 F . 
     Referring to  FIG.  22 F , the portable device places a date indicator  1204   e  in a date of the day block  1204  selected by the touch gesture  1200   g  and displays a popup window  1210   a  showing detailed information on an event registered in the selected date in an area near the selected date. In the shown example, the popup window  1210   a  is detailed information on the registered event of “Alice Birthday” of the selected date of “15” and provides at least one of a time such as “Tue, 15/01/2009 8:00 AM˜Tue, 15/01/2009 3:00 PM”, a place, and a map image. When an input  1200   h  of a back button which is one of the physical buttons located in the lower part of the first touch screen  12  is detected while the popup window  1210   a  is displayed, the portable device removes the popup window  1210   a  and restores the first and second touch screens  12  and  14  as illustrated in  FIG.  22 E . 
     When a predetermined touch gesture  1200   i , for example, a tap gesture or a touch and hold is detected from another one  1204  of the day blocks included in the first and second calendar areas  1208   a  and  1208   b  while the popup window  1210   a  is displayed, the portable device proceeds to  FIG.  22 G . 
     Referring to  FIG.  22 G , the portable device places a date indicator  1204   f  in the date of the day block  1204   d  selected by the touch gesture  1200   i  and removes the displayed popup window  1210   a  in response to the detection of the touch gesture  1200   i . When there is no event registered in the date of the day block  1204   d  selected by the touch gesture  1200   i , a new popup window is not displayed. 
       FIGS.  22 H to  22 J  illustrate a scenario for generating a new event in the expanded calendar area of the schedule management application according to an exemplary embodiment. 
     Referring to  FIG.  22 H , the portable device displays the first and second calendar areas  1208   a  and  1208   b  including day blocks corresponding to the selected month in the first and second touch screens  12  and  14 , respectively. When the menu button which is one of the physical buttons disposed in the lower part of the first touch screen  12  is selected, for example, when a touch gesture  1200   j  is detected while the calendar area of the month mode or the week mode is displayed over the two touch screens  12  and  14 , the portable device displays a menu window  1208   e  for the expanded calendar area in the lower part of the first touch screen  12  in response to the detection of the touch gesture  1200   j . The menu window  1208   e  includes at least one of a create key for creating a new event, a go to key for moving to a selected date, a today key for moving to the today&#39;s date, a search key for searching for a desired event, a deletion key for deleting a registered event, and a setting key for changing a setting of the schedule management application. 
     The portable device can detect a create command of a new event through the first or second touch screen  12  or  14  or the menu button in the lower part of the first touch screen  12 . For example, when a touch and hole  1200   k - 2  is detected from one of the day blocks included in the first and second calendar areas  1208   a  and  1208   b  or a tap gesture  1200   k - 1  is detected from the create key within the menu window  1208   e  loaded by selecting the menu button  1200   j  located in the lower part of the first touch screen  12 , the portable device recognizes the detection as a create command of the new event and proceeds to  FIG.  22 I . 
     Referring to  FIG.  22 I , the portable device replaces the first and second calendar areas  1208   a  and  1208   b  of the first and second touch screens  12  and  14  with first and second event create windows  1210   a  and  1210   b  and displays the replaced first and second event create windows  1210   a  and  1210   b  in response to the create commands  1200   k - 1  and  1200   k - 2 . The first event create window  1210   a  displayed in the first touch screen  12  includes an event title input area, a start date selection area, an end date selection area, and an all day selection area. The second event create window  1210   b  displayed in the second touch screen  14  includes at least one of a position input area related to the event, a participant input area, an alarm selection area, a repetition selection area, an explanation input area, and a storage key. When a tap gesture is detected from one of the input areas, a virtual keypad is displayed in a lower area of the corresponding touch screen. For example, when a tap gesture is detected from the event title input area, the first touch screen  12  displays the virtual keypad in a lower half part of the first touch screen  12  and receives an event title through the virtual keypad. 
       FIG.  22 J  illustrates another example of first and second event create windows  1210   c  and  1210   b  displayed when the touch and hold  1200   k - 2  is detected from a particular block of the calendar area  1208   a  displayed in the first touch screen  12 . As illustrated in  FIG.  22 J , a date in a position where the touch and hold  1200   k - 2  is detected is automatically input into a start date selection area and an end date selection area of the first event create window  1210   c . As a selectable embodiment, when the touch and hold  1200   k - 2  is generated in a time line of the calendar area of the day mode, a start time and/or an end time may be additionally input into the first event create window  1210   c  together with the start/end date. 
       FIGS.  22 K to  22 M  illustrate a scenario for deleting an event registered in the schedule management application according to an exemplary embodiment. 
     Referring to  FIG.  22 K , the portable device displays the first and second calendar areas  1208   a  and  1208   b  including day blocks included in the selected month in the first and second touch screens  12  and  14 , respectively. Although the calendar areas  1208   a  and  1208   b  of the month mode are illustrated herein, the event may be deleted in a similar way to that when the calendar area of the week mode is displayed over the two touch screens  12  and  14 . The portable device can detect a deletion command of the event through the first or second touch screen  12  or  14  or the menu button which is one of the physical buttons in the lower part of the first touch screen  12 . For example, when a tap gesture  1214   b  is detected from the deletion key within the menu window  1208   e  loaded by selecting the menu button  1214   a , the portable device recognizes the detection as a deletion command of the registered event and proceeds to  FIG.  22 L . 
     Referring to  FIG.  22 L , the portable device replaces the calendar area  1208   a  of the first touch screen  12  with an event deletion window  1212   a  and a deletion key  1212   b  for executing the deletion command and displays the replaced event deletion window  1212   a  and deletion key  1212   b  in response to the deletion command  1214   b . The event deletion window  121   a  lists event deletion items corresponding to the registered events of the month of the calendar area  1202   a  displayed in the first touch screen  12 . Each of the event deletion items includes an event name of each registered event and a check box, and an input of selecting the event item to be deleted is detected through the check box. When the calendar area  1208   a  of the month mode is displayed in the first touch screen  12 , the event deletion window  1212   a  includes events registered in the month of the calendar area  1208   a . Similarly, when the calendar area of the week mode is displayed in the first touch screen  12 , the event deletion window  1212   a  includes events registered in the corresponding week. 
     The second touch screen  14  may be in a deactivated state when the event deletion window  1212   a  is displayed in the first touch screen  12 . In the deactivated state, the second touch screen  14  is filled with a shadow and does not respond to the touch gesture. 
     When a tap gesture  1214   c  is detected from at least one check box of the event deletion item, that is, when a tap gesture  1214  is detected from “New year&#39;s Day” and “B&#39;s Birthday” and then a tap gesture  1214   d  is detected from the deletion key  1212   b  in the shown example, the portable device proceeds to  FIG.  22 M . 
     Referring to  FIG.  22 M , the portable device replaces the event deletion window  1212   a  and the deletion key  1212   b  of the first touch screen  12  with previous information, that is, the calendar area  1208   a  and displays the replaced calendar area  1208   a  in response to the detection of the tap gesture  1214   d . When the event deletion window  1212   a  is removed from the first touch screen  12 , the second touch screen  14  escapes from the deactivated state. From the first and second calendar areas  1208   a  and  1208   b  of  FIG.  22 M , the event item selected by the tap gesture  1214   c  on the event deletion window  1212   a , that is, “B&#39;s Birthday” is removed. 
     The portable device provides a more convenient user interface for a call application through the display device including the first touch screen and the second touch screen arranged on at least one foldable panel. 
       FIGS.  23 A to  23 P  illustrate a user interface of a call application according to one or more exemplary embodiments. 
       FIGS.  23 A to  23 E  illustrate a scenario for processing an outgoing call in the call application according to an exemplary embodiment. 
     Referring to  FIG.  23 A , the first touch screen  12  displays a first page  1302   a  of the home screen and a dock area  1302  including icons of frequently used applications, and the second touch screen  14  displays an A application  1302   b . When a predetermined touch gesture  1300   a , for example, a tap gesture is detected from an icon of the call application among icons of the application menu which provides the call application, a contact information application, a message application, and application lists included in the dock area  1302 , the portable device executes the call application and proceeds to  FIG.  23 B . Although the dock area  1302  displayed together with the home screen is illustrated herein, the following description can be similarly applied to a case where the dock area  1302  is displayed together with another application or the call application starts through a control of another menu of the portable device. 
     Referring to  FIG.  23 B , the portable device starts the call application in response to the detection of a touch gesture  1300   a  and replaces the first page  1302   a  of the home screen and the dock area  1302  with an outgoing call screen  1304  provided by the call application and displays the replaced outgoing call screen  1304  in the first touch screen  12 . The outgoing call screen  1304  includes at least one of a number display area  1304   a , a keypad area  1304   b , a call key  1304   c , a video call key  1304   d , a message sending key  1304   e , and a function key area  1304   f . Here, the function key area  1304   f  includes at least one of soft keys of functions which can be provided by the call application, for example, a keypad selection key for selecting whether to display the keypad area  1304   b  or selecting a type of keypad area  1304   b , a log key for showing a call record, and a contact information key for calling contact numbers. As a selectable embodiment, when the call application is displayed in the first touch screen  12 , the second touch screen  14  continuously displays the A application  1302   b.    
     When a phone number to be called is input through the keypad area  1304   b , the first touch screen  12  displays the input phone number in the number display area  1304   a , and further displays a picture image and a name of the contact information corresponding to the phone number when they exist. When the input of the phone number is completely input into the keypad area  1304   b  of the first touch screen  12  and a tap gesture  1300   b  is detected from the call key  1304   c , the portable device proceeds to  FIG.  23 C . 
     Referring to  FIG.  23 C , the portable device replaces the outgoing call screen  1304  with a dialing screen  1306  and displays the replaced dialing screen  1306  in the first touch screen  12  in response to the detection of the tap gesture  1300   b . The dialing screen  1306  includes a call participant identification area  1306   a  and a function key area  1306   b . The call participant identification area  1306   a  includes at least one of a name, a picture image, and a phone number of a counterpart call participant corresponding to the input phone number. The function key area  1306   b  includes at least one of soft keys of mid-call functions, for example, a phone number addition key, a dial pad call key, a call end key, a speaker key, a mute key, and a headset connection key. The phone number addition key, the mute key, and the headset connection key which cannot be used during the dialing may be deactivated. Here, the speaker key performs switching between a public call mode and a private call mode. Here, the public call mode refers to a state of relatively increasing volume of the speaker and sensitivity of the microphone to allow a remote call (or a state of turning on an external speaker), that is, a speaker phone mode, and the private call mode refers to a state of relatively decreasing volume of the speaker and sensitivity of the microphone to allow a call performed by the user having the portable device close to user&#39;s ear and mouth (or a state of turning off an external speaker). 
     When a call connection starts in a state where the first and second panels  2  and  4  including the first and second touch screens  12  and  14  are unfolded, the second touch screen  14  continuously displays the previously displayed A application  1302   b , is turned off, or displays a guide message screen  1302   c  of advising the user to fold the portable device for the call. 
     As a selectable embodiment, the call application connects the call in the public call mode in the state where the first and second panels  2  and  4  are unfolded. Further, when the first and second panels  2  and  4  of the portable device are folded-out such that the first touch screen  12  faces a front side during the dialing, the second touch screen  14  may be turned off. 
     When a counterpart call participant detects that the call is connected in response to the call connection, the portable device proceeds to  FIG.  23 D . 
     Referring to  FIG.  23 D , the portable device displays a mid-call screen  1308  in the first touch screen  12  in response to the detection of the call connection. The mid-call screen  1308  includes a call participant identification area  1308   a , a call duration time  1308   b , and a function key area  1308   c . The call participant identification area  1308   a  includes at least one of a picture image, a call participant name, and a phone number. The function key area  1308   c  includes at least one of a phone number addition key, a dial pad call key, a call end key, a speaker mode switching key, a mute key, and a headset connection key. 
     When the call is connected in the state where the first and second panels  2  and  4  including the first and second touch screens  12  and  14  are unfolded, the second touch screen  14  can remove the guide message screen  1302  and display the previously displayed information, that is, the A application  1302   b . As another embodiment, the second touch screen  14  continuously maintains the guide message screen  1302   c  during the call in the unfolded state. 
     When it is detected that the first and second panels  2  and  4  included in the portable device are folded-out  1300   b  during the call in the public call mode, the portable device proceeds to  FIG.  23 E . Referring to  FIG.  23 E , the portable device turns off the second touch screen  14  and switches the public call mode to a deactivated state, that is, the private call mode in response to the folded-out  1300   b  of the first and second panels  2  and  4 . Although not illustrated, when it is detected that the first and second panels  2  and  4  included in the portable device are unfolded during the call in the private call mode, the portable device displays again the previously displayed information, that is, the A application  1302   b  in the second touch screen  14  and activates the public call mode as illustrated in  FIG.  23 D . 
       FIGS.  23 F to  23 J  illustrate another scenario for processing an outgoing call in the call application according to an exemplary embodiment. 
     Referring to  FIG.  23 F , the first touch screen  12  displays the first page  1302   a  of the home screen and the dock area  1302 , and the second touch screen  14  displays a second page  1302   d . When a predetermined touch gesture  1300   c , for example, a tap gesture is detected from an icon of the call application included in the dock area  1302 , the portable device executes the call application and proceeds to  FIG.  23 G . Although the dock area  1302  displayed together with the home screen is illustrated herein, the following description can be similarly applied to a case where the dock area  1302  is displayed with another application or the call application starts through a control of another menu of the portable device. 
     Referring to  FIG.  23 G , the portable device starts the call application in response to the detection of the touch gesture  1300   c  and displays an outgoing call screen provided by the call application  1304 , that is, a number display area  1304   a , the keypad area  1304   b , the call key  1304   c , the video call key  1304   d , the message sending key  1304   e , and the function key area  1304   f  in the first touch screen  12 . For example, the key area  1304   f  includes at least one of a keypad selection key for selecting whether to display the keypad area  1304   b  or selecting a type of keypad area  1304   b , a log key for showing a call record, and a contact information key for loading contact numbers. As a selectable embodiment, when the call application starts in the first touch screen  12  while the second touch screen  14  displays the second page  1302   d  of the home screen, the dock area  1302  may be moved to and then displayed in a lower part of the second page  1302   d  of the second touch screen  14 . 
     When a phone number to be called is input through the keypad area  1304   b , the first touch screen  12  displays the input phone number in the number display area  1304   a , and further displays a picture image and a name of the contact information corresponding to the phone number when they exist. When the phone number is completely input and a tap gesture  1300   d  is detected from the call key  1304   c , the portable device proceeds to  FIG.  23 H . 
     Referring to  FIG.  23 H , the portable device displays the dialing screen  1306  in the first touch screen  12  in response to the detection of the tap gesture  1300   d . The dialing screen  1306  includes the call participant identification area  1306   a  and the function key area  1306   b . The call participant identification area  1306   a  includes at least one of a picture image, a call participant name, and a phone number. The function key area  1306   b  includes at least one of a phone number addition key, a dial pad call key, a call end key, a speaker key, a mute key, and a headset connection key. The phone number addition key, the mute key, and the headset connection key which cannot be used during the dialing may be deactivated. 
     When a call connection starts in a state where the first and second panels  2  and  4  including the first and second touch screens  12  and  14  are unfolded, the second touch screen  14  continuously displays the previously displayed A application  1302   b , is turned off, or displays a guide message screen  1302   c  of advising the user to fold the portable device for the call. At this time, the guide message screen  1302   c  may be displayed to be overwritten with the second page  1302   d  of the home screen and the dock area  1302   e  which are previously displayed. 
     As a selectable embodiment, the call application connects the call in the public call mode in the state where the first and second panels  2  and  4  are unfolded. Further, when the portable device is folded-out, the second touch screen  14  may be turned off. 
     When a counterpart call participant detects that the call is connected in response to the call connection, the portable device proceeds to  FIG.  23 I . 
     Referring to  FIG.  23 D , the portable device displays the mid-call screen  1308  in the first touch screen  12  in response to the detection of the call connection. The mid-call screen  1308  includes the call participant identification area  1308   a , the call duration time  1308   b , and the function key area  1308   c.    
     When the call is connected in the state where the first and second panels  2  and  4  including the first and second touch screens  12  and  14  are unfolded, the second touch screen can replace the guide message screen  1302   c  with the previously displayed information, that is, the second page  1302   d  of the home screen and display the replaced second page  1302   d . As another embodiment, the second touch screen  14  continuously maintains the guide message screen  1302   c  during the call in the unfolded state. 
     When it is detected that the first and second panels  2  and  4  included in the portable device are folded-out  1300   e  during the call in the public call mode, the portable device turns off the second touch screen  14  and switches the public call mode to the private call mode as illustrated in  FIG.  23 J . When the call is performed in the folded-out state and then ends, for example, when a tap gesture  1300   f  is detected from the call end key, the portable device replaces the mid-call screen  1308  of the second touch screen  12  with the previous information, that is, the second page  1302   d  of the home screen and the dock area  1302   e  and displays the replaced second page  1302   d  and the dock area  1302   e.    
       FIGS.  23 K to  23 M  illustrate a scenario for processing an incoming call in the call application according to one or more exemplary embodiments. 
     Referring to  FIG.  23 K , the first touch screen  12  displays a first application  1322   a  and the second touch screen  14  displays a second application  1322   b . The first and second applications  1322   a  and  1322   b  may be any of the home screen, the application menu, a basic application, and an application installed by the user. In the shown example, the first application  1322   a  is a message application such as a Short Messaging Service (SMS), an e-mail, or an Instant Messaging Service (IMS) and the second application  704  is a photo gallery application. As another example, the first and second touch screens  12  and  14  can display two task screens of one application in a main-sub mode or commonly display one task screen of one application in a full mode. When an incoming call is generated while the first and second touch screens  12  and  14  display one or more applications  1322   a  and  1322   b , the portable device proceeds to  FIG.  23 L . 
     Referring to  FIG.  23 L , the portable device starts the call application in response to the generation of the incoming call, and replaces the first application  1322   a  with an incoming call screen  1324  provided by the call application and displays the replaced incoming call screen  1324  in the first touch screen  12 . The incoming call screen  1324  includes at least one of a call participant identification area  1324   a , an incoming key area  1324   b , and a rejection message key  1324   c . The call participant identification area  1324   a  includes at least one of a picture image, a call participant name, and a phone number. The incoming key area  1324   b  may include an incoming key and a rejection key. The rejection key is used to reject the incoming call without sending a message. The rejection message key  1324   c  is used to automatically send a rejection message by the message application. 
     The second touch screen  14  is deactivated while the incoming call screen  1324  is displayed in the first touch screen  12  and a guide message screen  1326  of advising the user to fold the portable device for the call is displayed. 
     When a predetermined touch gesture  1310   a , for example, a tap gesture on the incoming key or a touch drag (slide) starting at the incoming key and moving in a predetermined direction is detected, the portable device proceeds to  FIG.  23 M . 
     Referring to  FIG.  23 M , the portable device connects a call with a counterpart call participant, and replaces the incoming call screen  1324  with the mid-call screen  1324  and displays the replaced mid-call screen  1324  in the first touch screen  12  in response to the detection of the touch gesture  1310   a . The mid-call screen  1324  includes the call participant identification area  1324   a , the call duration time  1324   b , and the function key area  1324   c . The call participant identification area  1324   a  includes at least one of a picture image, a counterpart call participant name, and a phone number. The function key area  1324   c  includes at least one of a phone number addition key, a dial pad call key, a call end key, a speaker mode switching key, a mute key, and a headset connection key. 
     As a selectable embodiment, when a touch gesture  1310   a  is detected from the incoming key in the state where the first and second panels  2  and  4  including the first and second touch screens  12  and  14  are unfolded, the call application starts a call connection in the public call mode and the second touch screen  14  is activated again. 
     When the call ends in the mid-call screen  1324 , for example, when a tap gesture  1320   b  is detected from the call end key within the function key area  1324   c , the portable device returns to  FIG.  23 K  to replace the mid-call screen  1324  of the first touch screen  12  with the previous information, that is, the first application  1322   a  and display the replaced first application  1322   a.    
       FIGS.  23 N to  23 P  illustrate another scenario for responding to an incoming call in the call application according to one or more exemplary embodiments. 
     Referring to  FIG.  23 N , the first and second touch screens  12  and  14  display first and second task screens  1326   a  and  1326   b  of the first application. The first application may be any of the home screen, the application menu, the basic application, and the application installed by the user. In the shown example, the first application is a photo gallery application providing two task screens having different depths, the first task screen  1326   a  of the first touch screen  12  includes one page of a plurality of thumbnail images, and the second task screen  1326   b  of the second touch screen  14  displays a picture image of one thumbnail image selected from the thumbnail images with a larger size, that is, a full size. 
     When an incoming call is generated while the first and second touch screens  12  and  14  displays the task screens  1326   a  and  1326   b  of the first application, the portable device proceeds to  FIG.  23 O . 
     Referring to  FIG.  23 O , the portable device starts the call application in response to the generation of the incoming call, and replaces the first task screen  1326   a  of the first application with an incoming call screen  1328  provided by the call application and displays the replaced incoming call screen  1328  in the first touch screen  12 . The incoming call screen  1328  includes a call participant identification area  1328   a , an incoming key area  1328   b , and a rejection message key  1328   c . The call participant identification area  1328   a  includes at least one of a picture image, a call participant name, and a phone number. The incoming key area  1328   b  may include an incoming key and a rejection key. The rejection message key  1328   c  is used to automatically send a rejection message by the message application. 
     The second touch screen  14  is deactivated while the incoming call screen  1328  is displayed in the first touch screen  12 , and a guide message screen  1330  of advising the user to fold the portable device for the call is displayed. 
     When a predetermined touch gesture  1320   c  on the incoming key within the incoming key area  1328   b , for example, a tap gesture or a touch drag (slide) starting at the incoming key and moving in a predetermined direction is detected, the portable device proceeds to  FIG.  23 P . 
     Referring to  FIG.  23 P , the portable device connects a call with a counterpart call participant, and replaces the incoming call screen  1328  with the mid-call screen  1332  and displays the replaced mid-call screen  1332  in the first touch screen  12  in response to the detection of the touch gesture  1320   c . The mid-call screen  1332  includes a call participant identification area  1332   a , a call duration time  1332   b , and a function key area  1332   c . The call participant identification area  1332   a  includes at least one of a picture image, a counterpart call participant name, and a phone number. The function key area  1332   c  includes at least one of a phone number addition key, a dial pad call key, a call end key, a speaker mode switching key, a mute key, and a headset connection key. 
     As a selectable embodiment, when a touch gesture  1320   c  is detected from the incoming key in the state where the first and second panels  2  and  4  including the first and second touch screens  12  and  14  are unfolded, the call application starts a call connection in the public call mode and the second touch screen  14  is activated again. 
     When the call ends in the mid-call screen  1332 , for example, when a tap gesture  1320   d  is detected from the call end key within the function key area  1332   c , the portable device returns to  FIG.  23 N  to replace the mid-call screen  1324  of the first touch screen  12  with the previous information, that is, the first task screen  1326   a  of the first application and display the replaced first task screen  1326   a.    
       FIG.  24 A  to  FIG.  24 R  illustrate user interface of the call application according to another exemplary embodiment. 
       FIGS.  24 A to  24 C  illustrate another scenario for responding to an incoming call of the call application according to an exemplary embodiment. 
     Referring to  FIG.  24 A , the first touch screen  12  displays a text input area (that is, typing area)  1402   a  of the first application, and the second touch screen  14  displays additional information  1402   d  of the first application. The first application is an application requiring a typing input and illustrated as a message application herein. The first touch screen  12  further displays a message display area  1402   b  displaying a message input through the text input area  1402   a  and a virtual keypad area  1402   c  together with the text input area  1402   a . The second touch screen  14  sequentially displays, for example, messages exchanged with the same counterpart as the additional information  1402   d  of the message application. 
     When an incoming call is generated while the first touch screen  12  displays the text input area  1402   a , the portable device proceeds to  FIG.  24 B . 
     Referring to  FIG.  24 B , the portable device starts the call application in response to the generation of the incoming call, and replaces the text input area  1402   a  other information  1402   b  and  1402   c  with an incoming call screen  1404  provided by the call application and displays the replaced incoming call screen  1404  in the first touch screen  12 . The incoming call screen  1404  includes a call participant identification area  1404   a , an incoming key area  1324   b , and a rejection message key  1404   c . The call participant identification area  1404   a  includes at least one of a picture image, a call participant name, and a phone number. The incoming key area  1404   b  may include an incoming key and a rejection key. The rejection message key  1404   c  is used to automatically send the rejection message by the message application. 
     The second touch screen  14  is deactivated while the incoming call screen  1404  is displayed in the first touch screen  12 , and a guide message screen  1406  of advising the user to fold the portable device for the call is displayed to be overwritten with the previous information  1402   d.    
     When a predetermined touch gesture  1400   a  on the incoming key within the incoming key area  1404   b , for example, a tap gesture, or a touch drag (slide) starting at the incoming key and moving in a predetermined direction is detected, the portable device proceeds to  FIG.  24 C . 
     Referring to  FIG.  24 C , the portable device connects a call with a counterpart call participant in response to the detection of the touch gesture  1400   a , and replaces the incoming call screen  1404  with the mid-call screen  1404  and displays the replaced mid-call screen  1406  in the first touch screen  12 . The mid-call screen  1406  includes a call participant identification area  1406   a , a call duration time  1406   b , and a function key area  1406   c . The call participant identification area  1406   a  includes at least one of a picture image, a counterpart call participant name, and a phone number. The function key area  1406   c  includes at least one of a phone number addition key, a dial pad call key, a call end key, a speaker mode switching key, a mute key, and a headset connection key. 
     When an incoming call is generated while information  1402   a ,  1402   b , and  1402   c  including the text input area  1402   a  is displayed in the first touch screen  12 , the portable device moves the text input area  1402   a  and other information  1402   b  and  1402   c  previously displayed in the first touch screen  12  to the second touch screen  12  and displays the input area  1402   a  and other information  1402   b  and  1402   c  in the second touch screen  14  while displaying the mid-call screen  1406  in the first touch screen  12 . At this time, the text input area  1402   a  includes a text input into the first touch screen  12  before the incoming call and displays the text in the second touch screen  14 . 
     As a selectable embodiment, in the state where the first and second panels  2  and  4  including the first and second touch screens  12  and  14  are unfolded, the portable device starts the call connection in the public call mode through the mid-call screen  1406  of the first touch screen  12  and provide support such that the user can continuously input messages through the text input area  1402   a  of the second touch screen  14 . 
     When a tap gesture  1400   b  is detected from the call end key of the function key area  1406   c , the portable device returns to  FIG.  24 A  to replace the mid-call screen  1406  of the first touch screen  12  with the previous information, that is, the text input area  1402   a , the message display area  1402   b , and the virtual keypad area  1402   c  and display the replaced text input area  1402   a , the message display area  1402   b , and the virtual keypad area  1402   c  and displays the information  1402   d  before the incoming call in the second touch screen  14 . 
       FIGS.  24 D to  24 H  illustrate another scenario for responding to an incoming call in the call application according to an exemplary embodiment. 
     Referring to  FIG.  24 D , the first and second touch screens  12  and  14  display first and second task screens  1410   a  and  1410   b  of the first application. The first application may be any of the home screen, the application menu, the basic application, and the application installed by the user. In the shown example, the first application is a photo gallery application providing two task screens having different depths, the first task screen  1410   a  of the first touch screen  12  includes one page of a plurality of thumbnail images, and the second task screen  1410   b  of the second touch screen  14  displays a picture image of one thumbnail image selected from the thumbnail images with a larger size, that is, a full size. 
     When an incoming call is generated while the first and second touch screens  12  and  14  display the task screens  1410   a  and  1410   b  of the first application, the portable device proceeds to  FIG.  24 E . 
     Referring to  FIG.  24 E  the portable device starts the call application in response to the generation of the incoming call, and replaces the first task screen  1410   a  of the first application with an incoming call screen  1412  provided by the call application and displays the replaced incoming call screen  1412  in the first touch screen  12 . The incoming call screen  1412  includes a call participant identification area  1412   a , an incoming key area  1412   b , and a rejection message key  1412   c . The call participant identification area  1412   a  includes at least one of a picture image, a call participant name, and a phone number. The incoming key area  1412   b  may include an incoming key and a rejection key. The rejection message key  1412   c  is used to automatically send a rejection message by the message application. 
     The second touch screen  14  is deactivated while the incoming call screen  1412  is displayed in the first touch screen  12 , and a guide message screen  1414  of advising the user to fold the portable device for the call is displayed. 
     When a predetermined touch gesture  1400   c  on the incoming key within the incoming key area  1412   b , for example, a tap gesture or a touch drag (slide) starting at the incoming key and moving in a predetermined direction is detected, the portable device proceeds to  FIG.  24 F . 
     Referring to  FIG.  24 F , the portable device connects a call with a counterpart call participant, and replaces the incoming call screen  1412  with the mid-call screen  1416  and displays the replaced mid-call screen  1416  in the first touch screen  12  in response to the detection of the touch gesture  1400   c . The mid-call screen  1416  includes a call participant identification area  1416   a , a call duration time  1416   b , and a function key area  1416   c . The call participant identification area  1416   a  includes at least one of a picture image, a counterpart call participant name, and a phone number. The function key area  1416   c  includes at least one of a phone number addition key, a dial pad call key, a call end key, a speaker mode switching key, a mute key, and a headset connection key. 
     As a selectable embodiment, when a touch gesture  1400   c  is detected from the incoming key in the state where the first and second panels  2  and  4  including the first and second touch screens  12  and  14  are unfolded, the call application starts a call connection in the public call mode and the second touch screen  14  is activated again as illustrated in  FIG.  24 F . 
     When the home button which is one of the physical buttons disposed in the lower part of the second touch screen  14  is selected  1400   d  while the mid-call screen  1416  is displayed in the first touch screen  12  and the previous task screen  1410   b  is displayed in the second touch screen  14 , the portable device proceeds to  FIG.  23 G . 
     Referring to  FIG.  23 G , the portable device displays a first page  1418   a  of the home screen in the second touch screen  14  in response to the selected home button  1400   d . At this time, the first touch screen  12  still displays the mid-call screen  1416 , and accordingly a dock area  1418   b  is displayed in the lower part of the second touch screen  14  together with the first page  1418   a.    
     When a tap gesture  1400   e  is detected from the call end key of the function key area  1416   c , the portable device proceeds to  FIG.  24 H  to replace the mid-call screen  1406  of the first touch screen  12  with the information before the incoming call, that is, the task screen  1410   b  of the first application and display the replaced task screen  1410   b  and maintains the first page  1418   a  of the home screen and the dock area  1418   b  of the second touch screen  14 . At this time, the first touch screen  12  displays a predetermined one of the task screens  1410   a  and  1410   b  of the first application, for example, the task screen  1418   b  having a final depth. 
       FIGS.  24 I to  24 J  illustrate a scenario for rejecting an incoming call in the call application according to one or more exemplary embodiments. 
     Referring to  FIG.  24 I , the portable device displays the incoming call screen  1404  provided by the call application in response to the generation of the incoming call. The incoming call screen  1404  includes the call participant identification area  1404   a , the incoming key area  1404   b , and the rejection message key  1404   c . The call participant identification area  1404   a  includes at least one of a picture image, a call participant name, and a phone number. The incoming key area  1404   b  may include an incoming key and a rejection key. The rejection message key  1404   c  is used to automatically send the rejection message by the message application. 
     The second touch screen  14  is deactivated while the incoming call screen  1404  is displayed in the first touch screen  12 , and the guide message screen  1406  of advising the user to fold the portable device for the call is displayed. 
     When a predetermined touch gesture  1400   f  on the rejection message key  1404   c  within the incoming call screen  1404 , for example, a tap gesture or a touch drag (slide) starting at the rejection message key  1404   c  and moving in a predetermined direction is detected, the portable device proceeds to  FIG.  24 J . 
     Referring to  FIG.  24 J , the portable device displays a rejection message screen  1420  in the first touch screen  12  and a text input area  1422   a  for inputting a rejection message and a virtual keypad  1422   c  in the second touch screen  14  in response to the detection of the touch gesture  1400   f . The rejection message screen  1420  includes a plurality of pre-designated commonly used phrases as the rejection messages for rejecting the incoming call and sending keys. Although not illustrated, when a tap gesture is detected from the sending key of one of the commonly used phrases, the portable device automatically sends the corresponding selected commonly used phrase, for example, a short message including one of “I&#39;ll call later”, “I&#39;m in meeting”, “I&#39;m in class now”, “In a cinema”, and “While driving” to a counterpart call participant of the incoming call. 
     When a message for the rejection, for example, “I&#39;m busy” is input through the virtual keypad  1422   c  and a tap gesture  1422   c  is detected from the sending key included in the text input area  1422   a , the portable device automatically sends a short message including the input message of “I&#39;m busy” to a counterpart call participant of the incoming call by the message application. 
     Although not illustrated, when the message is sent through the rejection message screen  1420  or the text input area  1422   a  and the virtual keypad  1422   c , the portable device replaces the incoming call screen  1404  and the guide message screen  1406  of the first and second touch screens  12  and  14  with the information displayed before the incoming call and displays the replaced information. 
       FIGS.  24 K to  24 N  illustrate another scenario for responding to a second incoming call in the call application according to one or more exemplary embodiments. 
     Referring to  FIG.  24 K , the portable device displays the mid-call screen  1406  provided by the call application in the first touch screen  12 , performs a call with a first counterpart call participant, for example, “AAA”, and displays the first application  1410   b  in the second touch screen  14 . The first application  1410   b  refers to another application, not the call application. When a second incoming call from a second counterpart call participant, for example, “BBB” is generated while the mid-call screen  1406  with the first counterpart call participant is displayed, the portable device proceeds to  FIG.  24 L . 
     Referring to  FIG.  24 L , the portable device replaces the mid-call screen  1406  of the first touch screen  12  with an incoming call screen  1426  of the second counterpart call participant and displays the incoming call screen  1426  while maintaining the call with the first counterpart call participant. The incoming call screen  1426  includes a call participant identification area  1426   a  of the second counterpart call participant “BBB”, an incoming key area  1426   b , and a rejection message key  1426   c . The second touch screen  14  can continuously display the first application  1410   b  while the incoming call screen  1426  with the second counterpart call participant is displayed in the first touch screen  12 . As a selectable embodiment, when at least one of the panels included in the portable device is folded while the incoming call screen  1426  with the second counterpart call participant is displayed in the first touch screen  12 , the second touch screen  14  may be turned off. 
     When a predetermined touch gesture  1400   g  on the incoming key within the incoming key area  1426   b , for example, a tap gesture or a touch drag (slide) starting at the incoming key and moving in a predetermined direction is detected, the portable device proceeds to  FIG.  24 M . 
     Referring to  FIG.  24 M , the portable device displays a multi incoming selection menu  1428  in the incoming call screen  1426  of the first touch screen  12  in a form of a popup window in response to the detection of the touch gesture  1400   g . The multi incoming selection menu  1428   a  includes a waiting key  1427   a  for having the call with the first counterpart call participant wait and an end key  1428   b  for ending the call. Although not illustrated, when a tap gesture is detected from the end key  1428   b , the portable device ends the call with the first counterpart call participant and displays the mid-call screen with the second counterpart call participant. When a tap gesture  1400   h  is detected from the waiting key  1428   a , the portable device has the call with the first counterpart call participant wait and proceeds to  FIG.  24 N . The waiting call is not connected with the microphone and the speaker. 
     Referring to  FIG.  24 N , the portable device connects the call with the second counterpart call participant by the call application, and replaces the incoming call screen  1426  of the first touch screen  12  with a multi mid-call screen  1430  and displays the replaced multi mid-call screen  1430 . The multi mid-call screen  1430  includes call participant identification areas  1430   a  of a plurality of counterpart call participants who perform the call such as “AAA” and “BBB”, a call swap key  1430   b , a merge key  1430   c , and a function key area  1430   d . Each of the call participant identification areas  1430   a  includes at least one of a small picture image, a counterpart call participant name, and a phone number, and the call participant identification area which is in a call connection state may be displayed with a shadow or highlighted. The function key area  1430   c  includes at least one of a phone number addition key, a dial pad call key, a call end key, a speaker mode switching key, a mute key, and a headset connection key. 
     The call swap key  1430   b  is used to swap a current call participant. When a tap gesture is detected from the call swap key  1430   b  in a state where the call is connected with the second counterpart call participant “BBB”, the portable device has the call with the second counterpart call participant “BBB” wait and connects the call with the first counterpart call participant “AAA”. The merge key  1430   c  is used to simultaneously connect calls with all the waiting counterpart call participants. When a tap gesture is detected from the merge key  1430   c  in a state where the call with the first counterpart call participant “AAA” is in a waiting state and the call with the second counterpart call participant “BBB” is connected, the portable device connects all the calls with both the first and second counterpart call participants “AAA” and “BBB”. The user can talk to both the first and second counterpart call participants through the portable device. 
     The second touch screen  14  can continuously display the first application  1410   b  while the multi mid-call screen  1430  is displayed in the first touch screen  12  in the state where the first and second panels  2  and  4  including the first and second touch screens  12  and  14  are unfolded. 
       FIGS.  24 O to  24 R  illustrate another scenario for responding to an incoming call by a motion of the portable device in the call application according to an exemplary embodiment. 
     Referring to  FIG.  24 O , the first touch screen  12  displays a first application  1432  in a state where the first and second panels  2  and  4  are completely folded such that the first and second touch screens  12  and  14  face outward. In the shown example, the first application  1432  is a photo gallery application which displays one page of thumbnail images. At this time, the second touch screen  14  may be turned off. When an incoming call is generated while the first application  1432  is displayed in the folded state, the portable device proceeds to  FIG.  24 P . 
     Referring to  FIG.  24 P , the portable device starts the call application in response to the generation of the incoming call, and replaces the first application  1432  with an incoming call screen  1434  provided by the call application and displays the replaced incoming call screen  1434  in the first touch screen  12 . The incoming call screen  1434  includes a call participant identification area  1434   a , an incoming key area  1434   b , and a rejection message key  1434   c . The call participant identification area  1434   a  includes at least one of a picture image, a call participant name, and a phone number. The incoming key area  1434   b  may include an incoming key and a rejection key. The rejection message key  1434   c  is used to automatically send a rejection message by the message application. 
     When the portable device detects overturning  1400   i  of making the second panel  4  including the second touch screen  14  side up while displaying the incoming call screen  1434  in the first touch screen  12  of the first panel  2  in the state where the first and second panels  2  and  4  are completely folded, the portable device proceeds to  FIG.  24 Q . 
     Referring to  FIG.  24 Q , the portable device turns off the first touch screen  12  and displays a rejection message screen  1436  in the second touch screen  14  in response to the detection of the overturning  1400   i . Further, when the portable device is not in a vibration mode, the portable device turns off a ringtone. The rejection message screen  1436  includes a plurality of predetermined commonly used phrases for rejecting the incoming call and sending keys for the commonly used phrases and a new rejection message create key for additionally selecting an input of a new rejection message. Although not illustrated, when the sending key of one of the commonly used phrases is selected, the portable device automatically sends the corresponding selected commonly used phrase, for example, one of “I&#39;ll call later”, “I&#39;m in meeting”, “I&#39;m in class now”, “In a cinema”, and “While driving” to a counterpart call participant of the incoming call by the message application. Further, when a tap gesture is detected from the new rejection message create key, the portable device displays an input window of the rejection message in the second touch screen  14 . 
     When unfolding  1400   j  of the first and second panels  2  and  4  is detected while the rejection message screen  1436  is displayed in the second touch screen  14 , the portable device proceeds to  FIG.  24 R . 
     Referring to  FIG.  24 R , the portable device displays the rejection message screen  1436  in the first touch screen  12  and displays a text input area  1438   a  and a virtual keypad  1438   b  for sending the rejection message in the second touch screen  14  in response to the detection of the unfolding  1400   j . When a message for the rejection, for example, “I&#39;m busy” is input through the virtual keypad  1438   b  and a tap gesture is detected from the sending key included in the text input area  1438   a , the portable device automatically sends a short message including the input message of “I&#39;m busy” to a counterpart call participant of the incoming call by the message application. 
     The portable device provides a more convenient user interface for a camera application through the display device including the first touch screen and the second touch screen arranged on at least one foldable panel. As described above, the portable device drives the camera application and takes a picture through at least one camera module included in the first and second panels including the first and second touch screens to store the taken picture as a picture image. 
     A position of the camera module may be variously determined according to selection made by the manufacturer. For example, a first camera module is located in a front upper part of the first panel  2  and a second camera module is located in a rear upper part of the second panel  4 , so that the first camera module operates as a front camera and the second camera module operates as a rear camera. As another example, one camera module is located in the front upper part of the second panel  4  and the camera module operates as the front camera or the rear camera according to whether the second panel  4  is folded. As another example, the first and second camera modules are located in the front upper part and the rear upper part of the second panel  4 , the first camera module operates as the front camera or the rear camera according to whether the second panel  4  is folded, and the second camera module operates as the rear camera when the first camera module operates as the front camera. 
       FIGS.  25 A to  25 L  and  FIGS.  26 A to  26 K  illustrate a user interface of the camera application according to one or more exemplary embodiments. 
     Here, an embodiment where the camera module is located in the front upper part of the second panel  4  including the second touch screen  14  will be described. Although not illustrated, an additional camera module may exist in a rear surface of the second panel  4 . When the portable device is in a portrait view mode, the first touch screen  12  which does not have the camera module is a main screen and the second touch screen  14  having the camera module is a sub screen. Although not illustrated, when the portable device is in a landscape view mode, an upper touch screen is a main screen and a lower touch screen is a sub screen. As another embodiment, the main screen and the sub screen may be determined according to the number and positions of the camera modules. 
     When the camera application is started by a shortcut button arranged in the housing of the portable device or a touch of a soft key provided through the touch screen of the portable device in the state where the first and second panels including the first and second touch screens  12  and  14  are unfolded, the camera application drives at least one camera module included in the portable device and displays, for example, screens shown in  FIG.  25 A  in the first and second touch screen  12  and  14 . 
     Referring to  FIG.  25 A , the first touch screen  12  displays a live view screen  1502   a  shot by the camera module in a basic camera module and a camera menu  1502   b , and the second touch screen  14  displays a camera mode menu  1504  for changing a camera mode. The camera mode menu  1504  includes mode buttons  1504   a ,  1504   b ,  1504   c , and  1504   d  corresponding to a plurality of camera modes. For example, the camera mode menu  1504  may include at least one of a basic camera button  1504   a  for shooting a scene or model through the camera module  24  in the state where the first and second panels  2  and  4  are folded, a self camera button  1504   b  for shooting the user him/herself through the camera module  24  in the state where the first and second panels  2  and  4  are folded, a dual camera button  1504   c  for displaying a shot image through both the first and second touch screens  12  and  14 , and a baby camera button  1504   d  for displaying an image or animation generating the interest of the shot subject through the second touch screen  14  shown to the shot subject. 
     When the camera application starts, the camera application is set to operate in the basic camera mode, and a button corresponding to the selected camera mode, that is, the basic camera button  1504   a  is highlighted with a bold line or a different color to be distinguished. Further, when a touch gesture, for example, a tap gesture is detected from the basic camera button  1504   a  within the camera mode menu  1504  provided through the second touch screen  14  is detected, the camera application operates in the basic camera mode. 
     The camera menu  1502   b  may be disposed to be included in one or both sides of the shot image  1502   a  and includes function buttons for the shooting such as a shutter button, a stored image loading button, a mode selection button, a flash selection button, a timer shooting button, a white balance button, a resolution selection button and the like. 
     As a selectable embodiment, when the portable device includes the camera module  24  located in the front surface of the first or second panel  2  or  4  and the camera module  26  located in the rear surface of the second panel  4 , the shot image  1502   a  may be reproduced by combining images of the front camera module  24  and the rear camera module  26 . 
     Referring to  FIG.  25 B , the portable device detects folding  1500   a  between the first and second panels  2  and  4  within a predetermined effective angle range while the shot image  1502   a  is displayed in the first touch screen  12  in the basic camera mode and proceeds to  FIG.  25 C . Referring to  FIG.  25 C , the portable device turns off the second touch screen  14  in response to the folding  1500   a  between the first and second panels  2  and  4 . As one embodiment, when the first and second panels  2  and  4  starts being folded, when the first and second panels  2  and  4  are folded within a predetermined relative angle (for example, 60 degrees), or when the first and second panels  2  and  4  are completely folded, the second touch screen  14  may be turned off. The first touch screen  12  maintains the shot image  1502   a  and the camera menu  1502   b  after the folding  1500   a.    
     Referring to  FIG.  25 D , the first touch screen  12  displays the shot image  1502   a  shot by the camera module  24  in the self camera mode and the camera menu  1502   b , and the second touch screen  14  displays the camera mode menu  1504  for changing the camera mode. The camera mode menu  1504  includes at least one of the basic camera button  1504   a , the self camera button  1504   b , the dual camera button  1504   c , and the baby camera button  1504   d . In the self camera mode, the self camera button  1504   b  is displayed with a bold line or a different color to be distinguished. 
     Referring to  FIG.  25 E , the portable device detects folding  500   b  between the first and second panels  2  and  4  while the shot image  1502   a  is displayed in the first touch screen  12  in the self camera mode and proceeds to  FIG.  25 F . Referring to  FIG.  25 F , the portable device displays the shot image  1502   a  of the self camera mode and the camera menu  1502   b  in the second touch screen  14  of the second panel  4  having the camera module  24  in the front surface thereof and turns off the first touch screen  12  of the first panel  2  which does not have the camera module  24  in response to the detection of the folding  1500   b  between the first and second panels  2  and  4 . 
     Referring to  FIG.  25 G , the first touch screen  12  displays the shot image  1502   a  shot by the camera module  24  in the dual camera mode and the camera menu  1502   b  and the second touch screen  14  displays the camera mode menu  1504  for changing the camera mode. The camera mode menu  1504  includes at least one of the basic camera button  1504   a , the self camera button  1504   b , the dual camera button  1504   c , and the baby camera button  1504   d . In the dual camera mode, the dual camera button  15004   c  is displayed with a bold line or a different color to be distinguished. 
     Referring to  FIG.  25 H , the portable device detects folding  1500   c  between the first and second panels  2  and  4  while the shot image  1502   a  is displayed in the first touch screen  12  in the dual camera mode and proceeds to  FIG.  25 I . Referring to  FIG.  25 I , the portable device displays a shot image  1502   c  in the second touch screen  14  without the camera menu  1502   b  in response to the detection of the folding  1500   c  between the first and second touch panels  2  and  4 . Because the shot image  1502   c  of the second touch screen  14  has the purpose to be shown to the shot subject, the shot image  1502   c  does not require including the camera menu. The first touch screen  12  maintains the shot image  1502   a  and the camera menu  1502   b  after the folding  1500   c.    
     Referring to  FIG.  25 J , the first touch screen  12  displays the shot image  1502   a  shot by the camera module  24  in the baby camera mode and the camera menu  1502   b , and the second touch screen  14  displays the camera mode menu  1504  for changing the camera mode. The camera mode menu  1504  includes at least one of the basic camera button  1504   a , the self camera button  1504   b , the dual camera button  1504   c , and the baby camera button  1504   d . In the self camera mode, the self camera button  1504   d  is displayed with a bold line or a different color to be distinguished. 
     Referring to  FIG.  25 K , the portable device detects folding  1500   d  between the first and second panels  2  and  4  while the shot image  1502   a  is displayed in the first touch screen  12  in the dual camera mode and proceeds to  FIG.  25 L . Referring to  FIG.  25 L , the portable device displays an animation  1502   d  pre-stored in the second touch screen  14  in response to the detection of the folding  1500   d  between the first and second touch panels  2  and  4 . The animation is a video stored in the portable device by the manufacturer or user to generate the interest of the shot subject, and may be selected by a setting menu provided by the camera application. For example, the setting menu may be loaded by selecting the menu button which is one of the physical buttons in the lower part of the first touch screen  12  displayed in the shot image  1502   a.    
     As one embodiment, the portable device stores a plurality of animations which can be used in the baby camera mode of the camera application and displays a previous or next animation (not shown) in the second touch screen  14  as a predetermine gesture  1502   d - 1 , for example, a left/right direction flick, a touch drag, or a sliding is detected from the second touch screen  14  while the animation  1502   d  is displayed in the second touch screen  14  in the baby camera mode. 
     Although not illustrated, the portable device can display the shot image  1502   a  and the camera menu  1502   b  in one of the first and second touch screens and display another application in the other touch screen. As one example, the first touch screen  12  displays the shot image  1502   a  and the camera menu  1502   b  in the basic camera mode and the second touch screen  14  displays another application. As another embodiment, the second touch screen  14  displays the shot image  1502   a  and the camera menu  1502   b  in the self camera mode and the first touch screen  12  displays another application. 
     When the camera mode menu is not displayed, the camera application supports switching of the camera mode through the camera menu  1502   b.    
       FIGS.  26 A to  26 C  illustrate a scenario of switching the camera mode by the camera menu  1502   b  of the portable device. Although it is herein illustrated that the touch screen which does not display the shot image  1502   a  is turned off, the following description can be applied to a case where another application is displayed in the touch screen which does not display the shot image  1502   a.    
     Referring to  FIG.  26 A , the first touch screen  12  displays the shot image  1502   a  and the camera menu  1502   b  and the second touch screen  14  is turned off. The camera menu  1502   b  includes function buttons such as a shutter button, a stored image loading button, a mode selection button  1508 , a flash selection button and the like. When a predetermined touch gesture  1510   a , for example, a tap gesture is detected from the mode selection button  1508 , the portable device proceeds to  FIG.  26 B . 
     Referring to  FIG.  26 B , the portable device displays a camera mode menu window  1512  for changing the camera mode in the shot image  1502   a  of the first touch screen  12  in response to the detection of the touch gesture  1510   a . The camera mode menu window  1512  includes check boxes  1512   a ,  1512   b ,  1512   c , and  1512   d  corresponding to a plurality of camera modules, for example, the basic camera mode, the self camera mode, the dual camera mode, and the baby camera mode. When a tap gesture  1510   b  is detected from the check box  1512   b  in the self camera mode among the check boxes  1512   a  to  1512   d , the portable device proceeds to  FIG.  26 C . 
     Referring to  FIG.  26 C , the portable device displays the shot image  1502   a  and the camera menu  1502   b  in the second touch screen  14  and turns off the first touch screen  12  in response to the detection of the tap gesture  1510   b . AS another embodiment, when another application is displayed in the second touch screen  14  before the camera mode is changed, the first touch screen  12  can display another application in response to the detection of the tap gesture  1510   b.    
     Although not illustrated, when a tap gesture is detected from the dual camera mode  1512   c  within the camera mode menu window  1512 , the portable device displays the shot image  1502   c  in the second touch screen  14  without the camera menu while maintaining the shot image  1502   a  of the first touch screen  12  and the camera menu  1502   b  as illustrated in  FIG.  25 I . Further, when a tap gesture is detected from the baby camera mode  1512   d  within the camera mode menu window  1512 , the portable device displays the pre-stored animation  1502   d  in the second touch screen  14  while maintaining the shot image  1502   a  of the first touch screen  12  and the camera menu  1502   b  as illustrated in  FIG.  25 L . 
       FIGS.  26 D to  26 G  illustrate a scenario of switching the camera mode by a touch of the touch screen which does not display the shot image. 
     Referring to  FIG.  26 D , the first touch screen  12  displays the shot image  1502   b  and the camera menu  1202   b  and the second touch screen  14  is turned off. The first panel  2  including the first touch screen  12  and the second panel  4  including the second touch screen  14  are in a folded state. When a predetermined touch gesture  1510   c , for example, two touches (double touch) or two taps (double tap) actually generated at the same time are detected from the turned off second touch screen  14 , the portable device proceeds to  FIG.  26 E . 
     Referring to  FIG.  26 E , the portable device displays the camera mode menu  1504  including mode buttons  1504   a ,  1504   b ,  1504   c , and  1504   d  corresponding to a plurality of camera modes in the second touch screen  14  in response to the detection of the touch gesture  1510   c . In an initial display, a camera mode corresponding to the shot image  1502   a  of the first touch screen  12  among the camera mode menu  1504 , that is, the basic camera button  1504   a  corresponding to the basic camera mode is highlighted in the shown example. 
     When a predetermined touch gesture  1510   d , for example, a tap gesture is detected from one of the different mode buttons within the camera mode menu  1504 , for example, the self camera button  1504   b , the portable device proceeds to  FIG.  26 F . 
     Referring to  FIG.  26 F , the portable device switches the camera mode to the self camera mode, displays the shot image  1502   a  and the camera menu  1502   b  in the second touch screen  14 , and turns off the first touch screen  12  in response to the detection of the touch gesture  1510   d . When a predetermined touch gesture  1510   e , for example, two touches (double touch) or two taps (double tap) which are actually generated at the same are detected from the turned off first touch screen  12 , the portable device proceeds to  FIG.  26 G . 
     Referring to  FIG.  26 G , the portable device displays the camera mode menu  1504  including the mode buttons  1504   a ,  1504   b ,  1504   c , and  1504   d  corresponding to the plurality of camera modes in the first touch screen  12  in response to the detection of the touch screen  1510   e . When the camera mode menu  1504  is displayed, the camera mode corresponding to the shot image  1502   a  of the second touch screen  14  among the camera mode menu  1504 , that is, the self camera button  1504   d  is highlighted. Similarly, when a tap gesture of the dual camera button  1504   c  or the baby camera button  1504   d  of the camera mode menu  1504  is detected, the portable device displays the shot image and the animation in the corresponding camera mode in the first and second touch screens  12  and  14 . 
       FIGS.  26 H to  26 J  illustrate a scenario of a timer shooting. Although a scenario in the basic camera mode will be described hereinafter, a count and a shot image can be displayed in a sub screen as well as a main screen in all the camera modes in the timer shooting. 
     Referring to  FIG.  26 H , the first touch screen  12  displays the shot image  1502   a  and the camera menu  1502   b , and the second touch screen  14  is turned off. The first panel  2  including the first touch screen  12  and the second panel  4  including the second touch screen  14  may be in a folded state. The camera menu  1502   b  of the first touch screen  12  includes a timer shooting button  1514 . When a tap gesture  1510   f  is detected from a shutter button  1516  in a state where the timer shooting is selected by using the timer shooting button  1514 , the portable device proceeds to  FIG.  26 I . 
     Referring to  FIG.  26 I , the portable device displays a count window  1518   a  in the shot image  1502   a  of the first touch screen  12  in response to the detection of the tap gesture  1510   f . The portable device simultaneously displays a shot image  1502   e  in the second touch screen  14  and displays a count window  1518   b  on the shot image  1502   a . Initially, the two count windows  1518   a  and  1518   b  display a preset maximum timer value N, for example, 5. As illustrated in  FIG.  26 J , the count windows  1518   a  and  1518   b  of the first and second touch screens  12  and  14  reduce the timer value one by one in the predetermined unit (for example, one second). When the timer value reaches 0 after N seconds, the portable device automatically performs the shooting by driving the camera module while feeding back a shooting effect sound. At this time, the timer value 0 may not be displayed. 
     Although not illustrated, a save screen may be displayed in the first and second touch screens  12  and  14  while a picture image shot just after the shooting is stored in a memory of the portable device. When the storage is quickly performed, a display of the save screen may be omitted. As illustrated in  FIG.  26 K , after the picture image is stored, the portable device returns the first and second touch screens  12  and  14  to a state before the shooting as illustrated in  FIG.  26 H . At this time, a thumbnail image  1502   f  miniaturized from the just previously shot picture image may be included in the camera menu  1502   b  in the first touch screen  12 . 
       FIGS.  27 A to  27 Q  illustrate examples of changing a view mode according to physical motion of the portable device according to one or more exemplary embodiments. 
       FIGS.  27 A to  27 C  illustrate a scenario when the folded portable device is unfolded. 
     Referring to  FIG.  27 A , the first and second panels  2  and  4  including the first and second touch screens  12  and  14  are in the folded state, that is, a state where a relative angle is 0 degrees, wherein the first touch screen  12  displays a first application, for example, a photo gallery application and the second touch screen  14  is turned off. Only the first touch screen  12  is displayed until the relative angle increases to be a threshold angle, for example, 60 degrees as the first and second panels  2  and  4  are slightly unfolded. When the relative angle reaches 60 degrees as the first and second panels  2  and  4  are further unfolded  1600   a , the portable device proceeds to  FIG.  27 B . 
     Referring to  FIG.  27 B , the portable device displays a running second application  1604 , for example, a music play application in the second touch screen  14  in response to the unfolding  1600   a  between the first and second panels  2  and  4 . When there is no another running application even though the portable device detects the unfolding  1600   a  between the first and second panels  2  and  4 , the portable device displays a first page  1606   a  of the home screen and a dock area  1606   b  in the second touch screen  14  as illustrated in  FIG.  27 C . 
       FIGS.  27 D to  27 E  illustrate a scenario when the unfolded portable device is folded. 
     Referring to  FIG.  27 D , the first and second panels  2  and  4  including the first and second touch screens  12  and  14  are in the unfolded state, that is, a state where a relative angle is actually 180 degrees, wherein the first touch screen  12  displays a first task screen  1604   a  of the second application and the second touch screen  14  displays a second task screen  1604  of the second application. Here, the second task screen  1604  is a screen designated to have a final depth of the second application. As one example, the second application is the music play application, the first task screen  1604   a  is a music list screen, and the second task screen  1604  is a music play screen. When the relative angle decreases to be a threshold angle, for example, an angle smaller than 60 degrees as the first and second panels  2  and  4  are folded  1600   b , the portable device proceeds to  FIG.  27 E . 
     Referring to  FIG.  27 E , the portable device turns off the second touch screen  14  and displays the task screen  1604  designated to have the final depth of the running second application in the first touch screen  12  in response to the folding  1600   b  between the first and second panels  2  and  4 . After the relative angle between the first and second panels  2  and  4  becomes smaller than 60 degrees, the first and second touch screens  12  and  14  are maintained until the relative angle reaches 0 degrees. 
       FIGS.  27 F to  27 G  illustrate another scenario when the unfolded portable device is folded. 
     Referring to  FIG.  27 F , the first and second panels  2  and  4  including the first and second touch screens  12  and  14  are in the unfolded state, that is, a state where the relative angle is actually 180 degrees, wherein the first touch screen  12  displays a third application  1608  and the second touch screen  14  displays the second application  1604 . For example, the third application  1608  is a game application and the second application  1604  is the music play application. When the relative angle decreases to be a threshold angle, for example, an angle smaller than 60 degrees as the first and second panels  2  and  4  are folded  1600   c , the portable device proceeds to  FIG.  27 G . 
     Referring to  FIG.  27 G , the portable device turns off the second touch screen  14  and maintains the running third application  1608  in the first touch screen  12  in response to the folding  1600   c  between the first and second panels  2  and  4 . After the relative angle between the first and second panels  2  and  4  becomes smaller than 60 degrees, the first and second touch screens  12  and  14  are maintained until the relative reaches 0 degrees. 
       FIGS.  27 H and  27 I  illustrate a scenario when the folded portable device is unfolded in a landscape view mode in which the portable device is rotated by 90 degrees in a left direction. 
     Referring to  FIG.  27 H , the first and second panels  2  and  4  including the first and second touch screens  12  and  14  is in the folded state, that is, a state in which the relative angle is 0 degrees. In the landscape view mode, the first touch screen  12  displays the first application  1602 , for example, a photo gallery application and the second touch screen  14  is turned off. Only the first touch screen  12  is displayed until the relative angle increases to be a predetermined threshold angle, for example, 60 degrees as the first and second panels  2  and  4  are slightly unfolded. When the relative angle becomes larger than 60 degrees and smaller than 180 degrees as the first and second panels  2  and  4  are further unfolded  1600   d , the portable device proceeds to  FIG.  27 I . 
     Referring to  FIG.  27 I , the portable device displays the running second application  1604 , for example, the music play application in the second touch screen  14  in response to the unfolding  1600   d  between the first and second panels  2  and  4 . When there is no other running application even though the portable device detects the unfolding  1600   d  between the first and second panels  2  and  4 , the portable device displays a first page  1606   a  of the home screen and a dock area  1606   b  in the second touch screen  14  as illustrated in  FIG.  27 J . 
       FIGS.  27 K to  27 M  illustrate a scenario when the folded portable device is unfolded in the landscape view mode in which the portable device is rotated by 90 degrees in a right direction. 
     Referring to  FIG.  27 K , the first and second panels  2  and  4  including the first and second touch screens  12  and  14  are in the folded state, that is, the state where the relative angle is 0 degrees. In the landscape view mode, the first touch screen  12  displays the first application  1602 , for example, the photo gallery application and the second touch screen  14  is turned off Only the first touch screen  12  is displayed until the relative angle increases to be a threshold angle, for example, 60 degrees as the first and second panels  2  and  4  are slightly unfolded. When the relative angle becomes larger than 60 degrees and smaller than 180 degrees as the first and second panels  2  and  4  are further unfolded  1600   e , the portable device proceeds to  FIG.  27 L . 
     Referring to  FIG.  27 L , the portable device displays the running second application  1604 , for example, the music play application in the second touch screen  14  in response to the unfolding  1600   e  between the first and second panels  2  and  4 . When there is no other running application even though the portable device detects the unfolding  1600   e  between the first and second panels  2  and  4 , the portable device displays the first page  1606   a  of the home screen and the dock area  1606   b  in the second touch screen  14  as illustrated in  FIG.  27 M . 
       FIGS.  27 N to  27 P  illustrate a scenario when the unfolded portable device is folded in the landscape view mode. 
     Referring to  FIG.  27 N , the first and second panels  2  and  4  including the first and second touch screens  12  and  14  are in the unfolded state, that is, the state where the relative angle is actually 180 degrees, wherein the first touch screen  12  displays the first task screen  1604  of the second application and the second touch screen  14  displays the second task screen  1604   a  of the second application. Here, the first task screen  1604  is a screen designated to have a final depth of the second application. For example, the second application is the music play application, the first task screen  1604  is the music play screen, and the second task screen  1604   a  is the music list screen. When the relative angle decreases to be a threshold angle, for example, 60 degrees as the first and second panels  2  and  4  are folded  1600   f , the portable device proceeds to  FIG.  27 O . 
     Referring to  FIG.  27 O , the portable device turns off the second touch screen  14  and displays the task screen  1604  designated to have the final depth of the running second application in the first touch screen  12  in response to the folding  1600   f  between the first and second panels  2  and  4 . After the relative angle between the first and second panels  2  and  4  becomes smaller than 60 degrees, the first and second touch screens  12  and  14  are maintained until the relative angle reaches 0 degrees. 
       FIGS.  27 P and  27 Q  illustrate another scenario when the unfolded portable device is folded in the landscape view mode. 
     Referring to  FIG.  27 P , the first and second panels  2  and  4  including the first and second touch screens  12  and  14  are in the unfolded state, that is, the state in which the relative angle is actually 180 degrees, wherein the first touch screen  12  displays the first application  1602  and the second touch screen  14  displays the second application  1604 . For example, the first application  1602  is the photo gallery application and the second application  1604  is the music play application. When the relative angle decreases to be a threshold angle, for example, 60 degrees as the first and second panels  2  and  4  are folded  1600   g , the portable device proceeds to  FIG.  27 Q . 
     Referring to  FIG.  27 Q , the portable device turns off the second touch screen  14  and maintains the running first application  1602  in the first touch screen  12  in response to the folding  1600   g  between the first and second panels  2  and  4 . After the relative angle between the first and second panels  2  and  4  becomes smaller than 60 degrees, the first and second touch screens  12  and  14  maintain displayed information until the relative angle reaches 0 degrees. 
     While the detailed description of the present invention has described the concrete embodiments, the embodiments can be modified without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the appended claims and the equivalents thereof.