Abstract:
An apparatus and method turn electronic book (e-book) pages in a portable terminal. The method determines whether a touch is input outside of a predetermined User Interface (UI) activation region of a screen of the portable terminal. The method determines whether a drag and release is input in a direction towards the predetermined UI activation region in response to detecting the touch. The method displays one of a preceding page and a next page on the screen in response to determining that the touch is outside of the predetermined UI activation region and that the drag and release is input in the direction towards the predetermined UI activation region.

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) AND CLAIM OF PRIORITY 
     The present application is related to and claims priority under 35 U.S.C. §119(a) to a Korean Patent Application entitled “Apparatus and method for turning e-book pages in portable terminal” filed in the Korean Intellectual Property Office on Oct. 1, 2010 and assigned Serial No. 10-2010-0095815, the contents of which are herein incorporated by reference. 
     TECHNICAL FIELD OF THE INVENTION 
     The present invention relates to a portable terminal. More particularly, the present invention relates to an apparatus and method for turning electronic book (e-book) pages in a portable terminal having an e-book function. 
     BACKGROUND OF THE INVENTION 
     Portable terminals are in trend of sudden spread due to the convenience of carrying. Accordingly, service providers (i.e., system manufacturers) are competitively developing terminals having special functions to guarantee many users. For example, the portable terminals are providing various functions of phone books, games, schedulers, short messages, the Internet, electronic mail (e-mail) messages, morning wakeup calls, Moving Picture Experts Group Phase 1 (MPEG-1) Audio Layer 3 (MP3) players, digital cameras, electronic dictionaries, e-books and the like. 
     Recently, an electronic book (e-book), one of information provision media replacing a conventional paper book, has been introduced to show text contents in an electronic display manner. The e-book is of a scheme of, after storing text contents in a flash memory or a built-in hard disk, showing the stored text contents through a display screen. The e-book has an advantage of being capable of, after storing a large amount of book stories at a time, selecting and showing a wanted story. 
     At this time, the display screen can display only contents of a restricted region. Accordingly, to continuously seamlessly show the next story of the contents, a User Interface (UI) providing a page move or scroll function should be provided. Generally, the e-book can show a story of text contents on a screen while moving through a page up/page down function using a key input means provided in the e-book. Through this method, a user can read the full story of the text contents stored in the e-book. 
     However, a UI of a scheme of turning pages through key manipulation as above is merely a direction control scheme of the most basic form and is not designed from an ergonomic viewpoint of making turning pages convenient for a user to use. So, there is a problem that the scheme is inconvenient for the user to convert pages of contents naturally. 
     SUMMARY OF THE INVENTION 
     To address the above-discussed deficiencies of the prior art, it is a primary object to provide at least the advantages below. Accordingly, one aspect of the present disclosure is to provide an apparatus and method for turning electronic book (e-book) pages in a portable terminal having an e-book function. 
     Another aspect of the present disclosure is to provide an apparatus and method for turning e-book pages in an analog manner, for enabling a user to convert pages of contents naturally with a feeling as if he/she really turns a book in a portable terminal having an e-book function. 
     The above aspects are achieved by providing an apparatus and method for turning e-book pages in a portable terminal. 
     According to one aspect of the present disclosure, a method for turning electronic book (e-book) pages in a portable terminal is provided. The method determines whether a touch is input outside of a predetermined User Interface (UI) activation region of a screen of the portable terminal. The method determines whether a drag and release is input in a direction towards the predetermined UI activation region in response to detecting the touch. The method displays one of a preceding page and a next page on the screen in response to determining that the touch is outside of the predetermined UI activation region and that the drag and release is input in the direction towards the predetermined UI activation region. 
     According to another aspect of the present disclosure, an apparatus for turning e-book pages in a portable terminal is provided. The apparatus includes a e controller and a display unit. The controller is configured to determine whether a touch is input outside of a predetermined right User Interface (UI) activation region of a screen of the portable terminal. The controller is configured to determine whether a drag and release is input in a direction towards the predetermined UI activation region in response to detecting the touch. The controller is configured to control a display unit to display one of a preceding page and a next page on the screen in response to determining that the touch is outside of the predetermined UI activation region and that the drag and release is input in the direction towards the predetermined UI activation region. The display unit is configured to display, on the screen, one of the preceding page and the next page of the e-book according to control of the controller. 
     Before undertaking the DETAILED DESCRIPTION OF THE INVENTION below, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document: the terms “include” and “comprise,” as well as derivatives thereof, mean inclusion without limitation; the term “or,” is inclusive, meaning and/or; the phrases “associated with” and “associated therewith,” as well as derivatives thereof, may mean to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of, or the like; and the term “controller” means any device, system or part thereof that controls at least one operation, such a device may be implemented in hardware, firmware or software, or some combination of at least two of the same. It should be noted that the functionality associated with any particular controller may be centralized or distributed, whether locally or remotely. Definitions for certain words and phrases are provided throughout this patent document, those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts: 
         FIG. 1  is a block diagram illustrating an apparatus construction of a portable terminal having an electronic book (e-book) function according to the present disclosure; 
         FIGS. 2A and 2B  are example diagrams illustrating a method for turning an e-book by one page in an analog manner in a portable terminal having an e-book function according to an embodiment of the present disclosure; 
         FIG. 3  is a flowchart illustrating a method for turning an e-book by one page in an analog manner in a portable terminal having an e-book function according to an embodiment of the present disclosure; 
         FIGS. 4A and 4B  are example diagrams illustrating a method for turning an e-book by several pages in an analog manner in a portable terminal having an e-book function according to an embodiment of the present disclosure; 
         FIGS. 5A and 5B  are a flowchart illustrating a method for turning an e-book by several pages in an analog manner in a portable terminal having an e-book function according to an embodiment of the present disclosure; 
         FIGS. 6A and 6B  are example diagrams illustrating a method for supporting a bookmark for an e-book in a portable terminal having an e-book function according to an embodiment of the present disclosure; and 
         FIGS. 7A and 7B  are a flowchart illustrating a method for supporting a bookmark for an e-book in a portable terminal having an e-book function according to an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       FIGS. 1 through 7B , discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged. Preferred embodiments of the present invention will be described herein below with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. And, terms described below, which are defined considering functions in the present invention, can be different depending on user and operator&#39;s intention or practice. Therefore, the terms should be defined on the basis of the disclosure throughout this specification. 
     Embodiments of the present disclosure provide a way of turning electronic book (e-book) pages in an analog manner in a portable terminal having an e-book function. 
     In the following description, portable terminals are meaning inclusive of all of a cellular phone with a touch panel, a Personal Communication System (PCS), a Personal Data Assistant (PDA), an International Mobile Telecommunication-2000 (IMT-2000) terminal and/or any other portable terminal suitable for displaying content. The following description is made using general constructions of the examples. 
       FIG. 1  is a block diagram illustrating an apparatus construction of a portable terminal having an e-book function according to the present disclosure. 
     As illustrated in  FIG. 1 , the portable terminal includes a controller  100 , a memory  102 , an input unit  104 , a display unit  106 , an e-book viewer  108 , and a communication unit  110 . 
     Referring to  FIG. 1 , the controller  100  controls a general operation of the portable terminal, and processes a function of turning e-book pages in an analog manner according to the present disclosure. 
     The memory  102  stores a microcode of a program for processing and controlling the controller  100  and a variety of reference data, temporary data generated in execution of a variety of programs, and a diversity of updateable depository data. In one embodiment, the memory  102  stores a program for turning e-book pages in an analog manner according to the present disclosure. 
     The input unit  104  has numeral key buttons and a plurality of function key buttons. The input unit  104  provides key button input data corresponding to a key button pressed by a user to the controller  100 . 
     The display unit  106  displays state information generated during operation of the portable terminal, limited number of characters, a large amount of moving pictures and still pictures and the like. In addition to common functions, according to the present disclosure, the display unit  106  is formed in a form of a touch panel and performs a function of the input unit  104 . That is, the display unit  106  senses a user&#39;s touch input and transmits the sensed touch input to the controller  100 . 
     The e-book viewer  108  performs a role of turning an e-book by one page/by several pages in an analog manner such that a user can convert pages of contents naturally with a feeling as if he/she really turns a book. Further, the e-book viewer  108  supports a bookmark for the e-book. 
     The communication unit  110  performs a function of transmitting/receiving and processing a wireless signal input/output through an antenna. For example, in a transmission mode, the communication unit  110  performs a function of processing original data through channel coding and spreading, converting the original data into a Radio Frequency (RF) signal, and transmitting the RF signal. In a reception mode, the communication unit  110  performs a function of processing a received RF signal through de-spreading and channel decoding, and restoring the signal to original data. 
       FIGS. 2A and 2B  are example diagrams illustrating a method for turning an e-book by one page in an analog manner in a portable terminal having an e-book function according to an embodiment of the present disclosure. 
     Referring to  FIGS. 2A and 2B , the terminal executes the e-book function, and displays, on a screen, a preset page of an e-book selected by a user. Here, a right partial region of the screen is defined as a right UI activation region, and a left partial region of the screen is defined as a left UI activation region. Here, the right UI activation region and the left UI activation region are preset suitable to a corresponding terminal. 
     As illustrated in  FIG. 2A , if a touch is input more left than the predetermined right UI activation region of the e-book and then, in a state where the touch is input, a drag and release is input in the right direction, the terminal displays the just preceding page on the screen. As illustrated in  FIG. 2B , if a touch is input more right than the predetermined left UI activation region of the e-book and then, in a state where the touch is input, a drag and release is input in the left direction, the terminal displays the just next page on the screen. 
       FIG. 3  is a flowchart illustrating a method for turning an e-book by one page in an analog manner in a portable terminal having an e-book function according to an embodiment of the present disclosure. 
     Referring to  FIG. 3 , in block  301 , the terminal determines if a request for execution of an e-book function is sensed according to user&#39;s key manipulation. 
     When the terminal determines in block  301  that the request for execution of the e-book function is sensed, in block  303 , the terminal executes the e-book function and, according to setting information of the e-book function, displays a preset page of an e-book selected by a user. For example, the setting information of the e-book function can be preset to display the first page of a corresponding e-book or display the previously last displayed page of the corresponding e-book at the time of execution of the e-book function. 
     After that, in block  305 , the terminal determines if a touch is input more left than a predetermined right UI activation region of the e-book and then, in a state where the touch is input, a drag and release is input in the right direction. 
     When the terminal determines in block  305  that the touch is input more left than the predetermined right UI activation region of the e-book and then, in the state where the touch is input, the drag and release is input in the right direction, in block  307 , the terminal displays the just preceding page on the screen. 
     In contrast, when the terminal determines in block  305  that the touch is not input more left than the predetermined right UI activation region of the e-book and then, in the state where the touch is input, the drag and release is input in the right direction, in block  309 , the terminal determines if a touch is input more right than a predetermined left UI activation region of the e-book and then, in a state where the touch is input, a drag and release is input in the left direction. 
     When the terminal determines in block  309  that the touch is input more right than the predetermined left UI activation region of the e-book and then, in the state where the touch is input, the drag and release is input in the left direction, in block  311 , the terminal displays the just next page on the screen. 
     In contrast, when the terminal determines in block  309  that the touch is not input more right than the predetermined left UI activation region of the e-book and then, in the state where the touch is input, the drag and release is input in the left direction, the terminal returns to block  305  and performs the subsequent blocks. 
     After that, the terminal terminates the algorithm according to the embodiment of the present disclosure. 
       FIGS. 4A and 4B  are example diagrams illustrating a method for turning an e-book by several pages in an analog manner in a portable terminal having an e-book function according to an embodiment of the present disclosure. 
     Referring to  FIGS. 4A and 4B , the terminal executes the e-book function, and displays, on a screen, a preset page of an e-book selected by a user. Here, a right partial region of the screen is defined as a right UI activation region, and a left partial region of the screen is defined as a left UI activation region. Here, the right UI activation region and the left UI activation region are preset suitable to a corresponding terminal. 
     If a touch is input in the predetermined right UI activation region of the e-book, the terminal displays the right side of the e-book. At this time, as illustrated in  FIG. 4A , if a drag and release is input in the left direction in a state where the touch is input in the predetermined right UI activation region, the terminal displays the just next page on the screen. In contrast, as illustrated in  FIG. 4B , if a drag is input in the right direction in a state where the touch is input in the predetermined right UI activation region, the terminal displays the number of pages increasing as much as the dragging on the right side of the e-book and, if a drag and release is input in the left direction in a state where the drag is input in the right direction, the terminal displays a next page corresponding to the number of the increased pages. 
     Although not illustrated, if a touch is input in the predetermined left UI activation region of the e-book, the terminal displays the left side of the e-book. At this time, if a drag and release is input in the right direction in a state where the touch is input in the predetermined left UI activation region, the terminal displays the just preceding page on the screen. In contrast, if a drag is input in the left direction in the state where the touch is input in the predetermined left UI activation region, the terminal displays the number of pages decreasing as much as the dragging on the left side of the e-book and, if a drag and release is input in the right direction in a state where the drag is input in the left direction, the terminal displays a preceding page corresponding to the number of the decreased pages. 
       FIGS. 5A and 5B  are a flowchart illustrating a method for turning an e-book by several pages in an analog manner in a portable terminal having an e-book function according to an embodiment of the present disclosure. 
     Referring to  FIGS. 5A and 5B , in block  501 , the terminal determines if a request for execution of an e-book function is sensed according to user&#39;s key manipulation. 
     When the terminal determines in block  501  that the request for execution of the e-book function is sensed, in block  503 , the terminal executes the e-book function and, according to setting information of the e-book function, displays a preset page of an e-book selected by a user. For example, the setting information of the e-book function can be preset to display the first page of a corresponding e-book or display the previously last displayed page of the corresponding e-book at the time of execution of the e-book function. 
     After that, in block  505 , the terminal determines if a touch is input in a predetermined right UI activation region of the e-book. 
     When the terminal determines in block  505  that the touch is input in the predetermined right UI activation region of the e-book, in block  507 , the terminal displays the right side of the e-book, and proceeds to block  509 . 
     Next, in block  509 , the terminal determines if a drag and release is input in the left direction in a state where the touch is input in the predetermined right UI activation region. 
     When the terminal determines in block  509  that the drag and release is input in the left direction in the state where the touch is input in the predetermined right UI activation region, in block  511 , the terminal displays the just next page on the screen. 
     In contrast, when the terminal determines in block  509  that the drag and release is not input in the left direction in the state where the touch is input in the predetermined right UI activation region, in block  513 , the terminal determines if a drag is input in the right direction in the state where the touch is input in the predetermined right UI activation region. 
     When the terminal determines in block  513  that the drag is input in the right direction in the state where the touch is input in the predetermined right UI activation region, in block  515 , the terminal displays the number of pages increasing as much as the dragging on the right side of the e-book and then, proceeds to block  517 . Here, the number of pages displayed on the right side increases more and more quickly according to the dragging. 
     After that, in block  517 , the terminal determines if a drag and release is input in the left direction in the state where the drag is input in the right direction. 
     When the terminal determines in block  517  that the drag and release is input in the left direction in the state where the drag is input in the right direction, in block  519 , the terminal displays a next page corresponding to the number of the increased pages. 
     When the terminal determines in block  517  that the drag and release is not input in the left direction in the state where the drag is input in the right direction, in block  518 , the terminal determines if in the state where the drag is input in the right direction, a drag is continuously input in the right direction. 
     When the terminal determines in block  518  that, in the state where the drag is input in the right direction, the drag is continuously input in the right direction, the terminal returns to block  515  and performs the subsequent blocks. 
     In contrast, when the terminal determines in block  518  that, in the state where the drag is input in the right direction, the drag is not continuously input in the right direction, the terminal terminates the algorithm according to the embodiment of the present disclosure. For example, in the state where the drag is input in the right direction, when a release is detected without a drag of the left direction or right direction, the terminal terminates the algorithm according to the embodiment of the present disclosure. 
     In contrast, when the terminal determines in block  513  that the drag is not input in the right direction in the state where the touch is input in the predetermined right UI activation region, the terminal returns to block  509  and performs the subsequent blocks. 
     In contrast, when the terminal determines in block  505  that the touch is not input in the predetermined right UI activation region of the e-book, in block  521 , the terminal determines if a touch is input in a predetermined left UI activation region of the e-book. 
     When the terminal determines in block  521  that the touch is input in the predetermined left UI activation region of the e-book, in block  523 , the terminal displays the left side of the e-book, and proceeds to block  525 . 
     After that, in block  525 , the terminal determines if a drag and release is input in the right direction in the state where the touch is input in the predetermined left UI activation region. 
     When the terminal determines in block  525  that the drag and release is input in the right direction in the state where the touch is input in the predetermined left UI activation region, in block  527 , the terminal displays the just preceding page on the screen. 
     In contrast, when the terminal determines in block  525  that the drag and release is not input in the right direction in the state where the touch is input in the predetermined left UI activation region, in block  529 , the terminal determines if a drag is input in the left direction in the state where the touch is input in the predetermined left UI activation region. 
     When the terminal determines in block  529  that the drag is input in the left direction in the state where the touch is input in the predetermined left UI activation region, in block  531 , the terminal displays the number of pages decreasing as much as the dragging on the left side of the e-book and then, proceeds to block  533 . Here, the number of pages displayed on the left side decreases more and faster according to the dragging. 
     Next, in block  533 , the terminal determines if a drag and release is input in the right direction in the state where the drag is input in the left direction. 
     When the terminal determines in block  533  that the drag and release is input in the right direction in the state where the drag is input in the left direction, in block  535 , the terminal displays a preceding page corresponding to the number of the decreased pages. 
     In contrast, when the terminal determines in block  533  that the drag and release is not input in the right direction in the state where the drag is input in the left direction, in block  534 , the terminal determines if, in the state where the drag is input in the left direction, a drag is continuously input in the left direction. 
     When the terminal determines in block  534  that, in the state where the drag is input in the left direction, the drag is continuously input in the left direction, the terminal returns to block  531  and performs the subsequent blocks. 
     In contrast, when the terminal determines in block  534  that, in the state where the drag is input in the left direction, the drag is not continuously input in the left direction, the terminal terminates the algorithm according to the embodiment of the present disclosure. For instance, in the state where the drag is input in the left direction, when a release is detected without a drag of the left direction or right direction, the terminal terminates the algorithm according to the embodiment of the present disclosure. 
     In contrast, when the terminal determines in block  529  that the drag is not input in the left direction in the state where the touch is input in the predetermined left UI activation region, the terminal returns to block  525  and performs the subsequent blocks. 
     In contrast, when the terminal determines in block  521  that the touch is not input in the predetermined left UI activation region of the e-book, the terminal returns to block  505  and performs the subsequent blocks. 
     After that, the terminal terminates the algorithm according to the embodiment of the present disclosure. 
       FIGS. 6A and 6B  are example diagrams illustrating a method for supporting a bookmark for an e-book in a portable terminal having an e-book function according to an embodiment of the present disclosure. 
     Referring to  FIGS. 6A and 6B , the terminal executes the e-book function and displays, on a screen, a preset page of an e-book selected by a user. After that, the terminal touches a bookmark On/Off switch to activate a bookmark function. At this time, an upper partial region of the screen is defined as an upper UI activation region, and the upper UI activation region is preset suitable to a corresponding terminal. The bookmark On/Off switch for activation/deactivation of the bookmark function can be positioned left in the predetermined upper UI activation region of the e-book. For example, the bookmark On/Off switch can be displayed in a clip shape. Further, a menu for automatically storing a position before moving to a bookmark page corresponding to a clip can be positioned right in the predetermined upper UI activation region of the e-book. For example, the menu can be displayed in an arrow shape. 
     As illustrated in  FIG. 6A , if a touch is input in the predetermined upper UI activation region of the e-book and then, in a state where the touch is input, a drag is input in the downward direction, the terminal determines that there is a request for addition of a bookmark, and generates a clip corresponding to a bookmark to be added. Here, a position of the clip can move along a drag direction until before a release is detected in a state where the drag is input in the downward direction. After that, if a release is input in the state where the drag is input in the downward direction, the terminal positions the generated clip in a position where the release is detected. Here, a shape, color and the like of the generated clip can be set according to preset information. As a different method, the terminal may position the generated clip in a position where the release is detected and simultaneously, display an input window through a popup window, receive an input of information of a shape, color and the like of the generated clip from a user, and change the shape, color and the like of the generated clip according to the received information. 
     As illustrated in  FIG. 6B , if a touch is input for a clip corresponding to a previously added bookmark, the terminal displays a corresponding bookmark page. If a long touch is sensed for the clip corresponding to the previously added bookmark, whose bookmark page has been displayed, the terminal determines that there is a request for displaying of information on the previously added bookmark, and displays the information on the previously added bookmark through a popup window. Here, the long touch represents a continuous touch for a predetermined period of time. In one example, the predetermined period of time may be one or two seconds. The information on the bookmark can include, for example, information of a generation date of the bookmark, a generation time, a bookmark page and/or any other information regarding the bookmark. Further, the popup window can display not only information on a corresponding bookmark but also a memo menu for memo composition and a move menu for position change of the bookmark. In this example, if the memo menu is selected from a user, the terminal can display a memo window and receive an input of memos to be written about the bookmark. If the move menu is selected from the user, the terminal can perform a bookmark position change mode and receive an input of a changed position of a clip corresponding to the bookmark. 
     Although not illustrated, if a touch is input for a clip corresponding to a previously added bookmark, the terminal displays a corresponding bookmark page. If a drag and release is input in the left/right direction in a state where the touch is input for the clip corresponding to the previously added bookmark, whose bookmark page has been displayed, the terminal determines that there is a request for movement to the bookmark page corresponding to the previously added bookmark, and moves to the bookmark page. 
     Although not illustrated, if a touch is input for a clip corresponding to a previously added bookmark and then, in a state where the touch is input, a drag and release is input in the upward direction, the terminal determines that there is a request for deletion of the previously added bookmark, and deletes a clip corresponding to the previously added bookmark. 
       FIGS. 7A and 7B  are a flowchart illustrating a method for supporting a bookmark for an e-book in a portable terminal having an e-book function according to an embodiment of the present disclosure. 
     Referring to  FIGS. 7A and 7B , in block  701 , the terminal determines if a request for execution of an e-book function is sensed according to user&#39;s key manipulation. 
     When the terminal determines in block  701  that the request for execution of the e-book function is sensed, in block  703 , the terminal executes the e-book function and, according to setting information of the e-book function, displays a preset page of an e-book selected by a user. For example, the setting information of the e-book function can be preset to display the first page of a corresponding e-book or display the previously last displayed page of the corresponding e-book at the time of execution of the e-book function. 
     Next, in block  705 , the terminal determines if a bookmark “On” switch is touched (i.e., release after touch). Here, the bookmark “On” switch can be, for example, positioned left in a predetermined upper UI activation region of the e-book, and can be displayed in a clip shape. According to another embodiment of the present disclosure, the bookmark “On” switch may be realized as one switch performing all of the function of a bookmark “On” switch and the function of a bookmark “Off” switch. In this example where the switch is touched in a bookmark “Off” state, the switch can transit to a bookmark “On” state to activate a bookmark function. In an example where the switch is touched in the bookmark “On” state, the switch can transit to the bookmark “Off” state to deactivate the bookmark function. 
     When the terminal determines in block  705  that the bookmark “On” switch is touched, in block  707 , the terminal activates the bookmark function and then, proceeds to block  709 . 
     Next, in block  709 , the terminal determines if a touch is input in the predetermined upper UI activation region of the e-book and then, in a state where the touch is input, a drag is input in the downward direction. 
     When the terminal determines in block  709  that the touch is input in the predetermined upper UI activation region of the e-book and then, in the state where the touch is input, the drag is input in the downward direction, the terminal determines that there is a request for addition of a bookmark and, in block  711 , generates a clip corresponding to a bookmark to be added and proceeds to block  713 . Here, a position of the clip can move along a drag direction until before a release is detected in a state where the drag is input in the downward direction. 
     Next, in block  713 , the terminal determines if a release is detected in the state where the drag is input in the downward direction. 
     When the terminal determines in block  713  that the release is input in the state where the drag is input in the downward direction, in block  715 , the terminal positions the generated clip in a position where the release is detected, and terminates the algorithm according to the embodiment of the present disclosure. Here, a shape, color and the like of the generated clip can be set according to preset information. In another example, the terminal may position the generated clip in the position where the release is detected and simultaneously display an input window through a popup window, receive an input of information of the shape, color and the like of the generated clip from a user, and change the shape, color and the like of the generated clip according to the received information. 
     In contrast, when the terminal determines in block  709  that the touch is input in the predetermined upper UI activation region of the e-book and then, in the state where the touch is input, the drag is not input in the downward direction, in block  717 , the terminal determines if a touch is input for a clip corresponding to a previously added bookmark. 
     When the terminal determines in block  717  that the touch is input for the clip corresponding to the previously added bookmark, in block  718 , the terminal displays a corresponding bookmark page, and proceeds to block  719 . 
     Next, in block  719 , the terminal determines if a long touch is sensed for the clip corresponding to the previously added bookmark, whose bookmark page has been displayed. Here, the long touch represents a continuous touch for a predetermined period of time. In one example, the predetermined period of time may be one or two seconds. 
     When the terminal determines in block  719  that the long touch is sensed for the clip corresponding to the previously added bookmark, whose bookmark page has been displayed, the terminal determines that there is a request for displaying of information on the previously added bookmark, whose bookmark page has been displayed and, in block  720 , displays the information on the previously added bookmark through a popup window and terminates the algorithm according to the embodiment of the present disclosure. Here, the information on the bookmark can include information of a generation date of the bookmark, a generation time, a bookmark page and the like. Further, the popup window can display not only information on a corresponding bookmark but also a memo menu for memo composition and a move menu for position change of a corresponding bookmark. In this example, if the memo menu is selected from a user, the terminal can display a memo window and receive an input of memos to be written about the bookmark. If the move menu is selected from the user, the terminal can perform a bookmark position change mode and receive an input of a changed position of a clip corresponding to the bookmark. 
     In contrast, when the terminal determines in block  719  that the long touch is not sensed for the clip corresponding to the previously added bookmark, whose bookmark page has been displayed, in block  721 , the terminal determines if a drag and release is detected in the left/right direction in a state where the touch is input for the clip corresponding to the previously added bookmark. 
     When the terminal determines in block  721  that the drag and release is input in the left/right direction in the state where the touch is input for the clip corresponding to the previously added bookmark, the terminal determines that there is a request for movement to the bookmark page corresponding to the previously added bookmark, which has been displayed and, in block  722 , moves to the bookmark page and terminates the algorithm according to the embodiment of the present disclosure. 
     In contrast, when the terminal determines in block  721  that the drag and release is not input in the left/right direction in the state where the touch is input for the clip corresponding to the previously added bookmark, in block  723 , the terminal determines if a release is detected in the state where the touch is input for the clip corresponding to the previously added bookmark. 
     When the terminal determines in block  723  that the release is detected in the state where the touch is input for the clip corresponding to the previously added bookmark, the terminal terminates the algorithm according to the embodiment of the present disclosure. 
     In contrast, when the terminal determines in block  723  that the release is not detected in the state where the touch is input for the clip corresponding to the previously added bookmark, the terminal returns to block  719  and performs the subsequent blocks. 
     In contrast, when the terminal determines in block  717  that the touch is not input for the clip corresponding to the previously added bookmark, in block  725 , the terminal determines if a touch is input for a clip corresponding to a previously added bookmark and then, in a state where the touch is input, a drag and release is input in the upward direction (e.g., till the end of the upward direction). 
     When the terminal determines in block  725  that the touch is input for the clip corresponding to the previously added bookmark and then, in the state where the touch is input, the drag and release is input in the upward direction, the terminal determines that there is a request for deletion of the previously added bookmark and, in block  727 , the terminal deletes the clip corresponding to the previously added bookmark and terminates the algorithm according to the embodiment of the present disclosure. 
     In contrast, when the terminal determines in block  725  that the touch is input for the clip corresponding to the previously added bookmark and then, in the state where the touch is input, the drag and release is not input in the upward direction, the terminal returns to block  709  and performs the subsequent blocks. 
     Next, the terminal terminates the algorithm according to the embodiment of the present disclosure. 
     As described above, embodiments of the present invention have an advantage that, although not learning an equipment use method, a user can convert pages of contents naturally with a feeling as if he or she is really turning pages in a book, by providing a UI of turning e-book pages in an analog manner in a portable terminal having an e-book function. 
     Although the present disclosure has been described with an exemplary embodiment, various changes and modifications may be suggested to one skilled in the art. It is intended that the present disclosure encompass such changes and modifications as fall within the scope of the appended claims.