Patent Publication Number: US-2012038576-A1

Title: Method and device for inputting characters

Description:
PRIORITY 
     This application claims priority under 35 U.S.C. §119(a) to Korean Patent Applications entitled “Method and Device for Inputting Characters” filed in the Korean Industrial Property Office on Aug. 13, 2010 and assigned Serial No. 10-2010-0078327, and filed on Aug. 10, 2011 and assigned Serial No. 10-2011-0079866, the contents of both of which are incorporated herein by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates generally to a method and a device for inputting characters, and more particularly, to a method and a device for inputting characters, by which a user can rapidly input the characters through multi-input using both hands. 
     2. Description of the Related Art 
     In modern society, portable terminals are well-known as devices capable of inputting characters. The portable terminal has become a necessity of life due to simplicity and portability, and is commonly used. Such a portable terminal provides various functions in addition to the typical call function, such as text message transmission. 
     However, since the size of the portable terminal must remain small, the conventional method for inputting characters in the portable terminal is complicated. 
     When a user inputs characters in the portable terminal having a touch screen, the user touches keys included in an input unit of the touch screen unit by using a finger or a pointer, to input characters and numbers. 
     The input unit used for inputting the characters employs a reduced QWERTY-type keyboard similar to that of a typical computer terminal or an input scheme, which uses a reduced number of keys while input of a character is achieved through repeated input of a key. 
     Further, the MOAKEY input scheme using the drag input property has been employed in the touch screen unit. 
     However, the aforementioned conventional scheme uses a single touch input scheme using one hand, thereby making it slower than the character input using both hands, and is also detrimentally affected by the increased number of touch times when inputting certain diphthongs ( ,  ,  ,  ,  ,  ,  ,  ,  ,  ,  , and  ). 
     SUMMARY OF THE INVENTION 
     Accordingly, the present invention has been made to solve the above-stated problems occurring in the prior art, and the present invention provides a method and a device for inputting characters, by which a user can rapidly input characters through multi-input using both hands. 
     In accordance with an aspect of the present invention, there is provided a method for inputting characters including when a touch or a drag is generated while input of a key, in which a consonant is arranged, is maintained in a touch screen unit, switching to a multi-input mode for activating the touch screen unit as a virtual area for inputting a vowel, and combining a vowel input through a touch or a drag on the virtual area with the consonant and displaying a combined character in the multi-input mode. 
     In accordance with another aspect of the present invention, there is provided a device for inputting characters, including a touch screen unit in which multiple keys are activated as a virtual area for inputting a vowel in a multi-input mode, and a controller for switching to the multi-input mode when a touch or a drag is generated in the touch screen unit while input of a key, in which a consonant is arranged, is maintained, and combining a vowel input through a touch or a drag on the virtual area with the consonant and displaying a combined character in the multi-input mode. 
     The present invention provides the method and the device for inputting characters, which allows the multi-input using both hands, to enable rapid input of the characters in comparison with the scheme of inputting the characters with one hand. Further, in inputting the diphthong, the number of touch times is reduced through performing the touch or drag based on the position of the key in which the consonant is arranged, thereby effectively achieving rapid input of the characters. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  illustrates the construction of a portable terminal according to the present invention; 
         FIGS. 2A to 2D  illustrate an operation of inputting characters in a portable terminal according to the present invention; 
         FIGS. 3A to 3B  illustrate an operation of inputting characters in a portable terminal according to the present invention; 
         FIGS. 4A and 4B  illustrate an operation of inputting characters in a portable terminal according to the present invention; and 
         FIG. 5  illustrates an operation of inputting characters in a portable terminal according to the present invention. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION 
     Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same elements will be designated by the same reference numerals although they are shown in different drawings. Further, a detailed description of known functions and configurations incorporated herein will be omitted for the sake of clarity and conciseness. 
       FIG. 1  illustrates the construction of a portable terminal according to the present invention. 
     Referring to  FIG. 1 , a Radio Frequency (RF) unit  123  performs a wireless communication function of a portable terminal. The RF unit  123  includes an RF transmitter (not shown) for up-converting and amplifying a frequency of a transmitted signal and an RF receiver (not shown) for low-noise amplifying a received signal and down-converting the frequency. A data processor  120  includes a transmitter (not shown) for encoding and modifying the transmitted signal and a receiver (not shown) for demodulating and decoding the received signal. That is, the data processor  120  includes a modem (not shown) and a codec (not shown). Here, the codec includes a data codec for processing packet data, and an audio codec for processing an audio signal, such as voice. An audio processor  125  reproduces a received audio signal output from the audio codec of the data processor  120  or transmits a transmitted audio signal generated from a microphone to the audio codec of the data processor  120 . 
     A memory  130  may include a program memory (not shown) and a data memory(not shown). The program memory may store programs for controlling a general operation of the portable terminal, and programs for switching to a multi-input mode, in which a touch screen unit is activated as a virtual area for inputting vowels when a touch or a drag is generated while the input of a key in which a consonant is arranged in the touch screen unit is maintained. Further, the data memory performs a function of temporarily storing data generated during the execution of the programs. 
     A controller  110  performs a function of a general operation of the portable terminal. 
     When a touch or a drag is generated in the touch screen unit  160  while the input of a key in which a consonant is arranged is maintained, the controller  110  makes a control for switching to the multi-input mode in which the touch screen unit  160  is activated as the virtual area for the input of a vowel. 
     Further, the controller  110  makes a control so that a vowel input through the touch or drag in the virtual area in the multi-input mode is combined with the consonant and a combined character is displayed. 
     In the multi-input mode, a user can input characters by using both hands. One hand maintains the input of the key, in which the consonant is arranged, and the other hand generates a touch or drag for inputting a vowel in the touch screen unit  160  activated as the virtual area, so that the consonant and the vowel are combined and the character is input. 
     The controller  110  may control so that the virtual area is divided into multiple regions based on the position of the key in which the input consonant is arranged, and the multiple areas is visually divided and displayed according to the user&#39;s selection. 
     Under the control of the controller  110 , a vowel corresponding to an input region among the multiple regions of the virtual area can be input by the touch for inputting the vowel on the touch screen unit  160  activated as the virtual area. 
     Also under the control of the controller  110 , a vowel according to a corresponding input region among the multiple regions of the virtual area and a shape of a drag can be input by the drag for inputting the vowel on the touch screen unit  160  activated as the virtual area. 
     Further, under the control of the controller  110 , a vowel can be input according to a corresponding input region in which the touch is input and a corresponding input region in which the drag is input, and a shape of a drag in the touch screen unit  160  activated as the virtual area. 
     The shape of the drag includes a straight drag (hereinafter ‘straight drag’) and a half-ellipsoidal drag. The straight drag includes upward/downward/leftward/rightward straight drags. The half-ellipsoidal drag includes a half-ellipsoidal drag in the left direction and a half-ellipsoidal drag in the right direction, both of which may be performed in a clockwise and counterclockwise direction. 
     Under the control of the controller  110 , data such as a character, a number, and a special sign, arranged on the multiple keys are transparently displayed and the type of corresponding vowels which can be input through a touch or drag on each of the multiple regions included in the virtual area is displayed in the touch screen unit  160 . 
     When the vowel is input in the multi-input mode, the controller  110  controls such that the input vowel is displayed in the form of a text balloon in an upper side of the key in which the consonant is arranged so that the user can identify the input vowel. 
     When a single input mode is switched to the multi-input mode in the portable terminal, the controller  110  controls such that the switching to the multi-input mode is notified through at least one of an indicator, a haptic effect, an alarming sound, and a change of a background image, which are discriminated from those of the single input mode. 
     When the multi-input mode is terminated and it is switched to the single input mode in the portable terminal, the controller  110  controls such that the termination of the multi-input mode is notified through at least one of an indicator, a haptic effect, an alarming sound, and a change of a background image, which are discriminated from those of the multi-input mode. 
     The termination of the multi-input mode is generated when the input of the key, in which the consonant is arranged, is not maintained, and the portable terminal switches the multi-input mode to the single input mode according to the termination of the multi-input mode. 
     When the virtual area is divided into the multiple regions, i.e. a right region and a lower region, based on the key, in which the consonant is arranged and of which the input is maintained, when a touch is generated in the right region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     When the straight drag in the right direction is generated in the right region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     When the straight drag in the left direction is generated in the right region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     When the straight drag in the right direction is continuously generated two times in the right region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     When the straight drag in the left direction is continuously generated two times in the right region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     When the half-ellipsoidal drag in the left direction is generated in the right region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     When the half-ellipsoidal drag in the right direction is generated in the right region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     When the straight drag in the left direction is continuously generated two times and then a touch is generated in the right region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     When the straight drag in the right direction is continuously generated two times and then a touch is generated in the right region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     When a touch is generated in the lower region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     When the straight drag in a downward direction is generated in the lower region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     When the straight drag in an upward direction is generated in the lower region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     When the straight drag in a downward direction is continuously generated two times in the lower region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     When the straight drag in an upward direction is continuously generated two times in the lower region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     When a touch is generated in the lower region and then a touch is generated in the right region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     When the straight drag in a downward direction is generated in the lower region and then the straight drag in the left direction is generated in the right region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     When the straight drag in an upward direction is generated in the lower region and then the half-ellipsoidal drag in the right direction is generated in the right region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     When the straight drag in an upward direction is generated in the lower region and then the straight drag in the right direction is generated in the right region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     When the straight drag in a downward direction is generated in the lower region and then a touch is generated in the right region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     When the straight drag in an upward direction is generated in the lower region and then a touch is generated in the right region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     When the straight drag in a downward direction is generated in the lower region and then the half-ellipsoidal drag in the left direction is generated in the right region, the controller  110  controls such that the vowel ‘ ’ is combined with the consonant and a combined character is displayed. 
     The controller  110  activates all remaining regions other than the key in which the input consonant is arranged as the virtual area for inputting the vowel. Further, the controller  110  controls such that a corresponding vowel is input and displayed next to the input consonant through a touch or a direction of a drag input on the virtual area. 
     The controller  110  transparently displays data such as a character, a number, and a special sign, arranged on the multiple keys included in the touch screen unit  160 , which is activated as the virtual area, and displays the type of corresponding vowels which can be input through a touch or a direction of a drag on the virtual area. 
     When a straight drag in a left direction is generated, the controller  110  controls such that a vowel ‘a’ is input and displayed next to the consonant. 
     When a straight drag in a right direction is generated, the controller  110  controls such that a vowel ‘e’ is input and displayed next to the consonant. 
     When a touch is generated, the controller  110  controls such that a vowel ‘i’ is input and displayed next to the consonant. 
     When a straight drag in an upward direction is generated, the controller  110  controls such that a vowel ‘o’ is input and displayed next to the consonant. 
     When a straight drag in a downward direction is generated, the controller  110  controls such that a vowel ‘u’ is input and displayed next to the consonant. 
     A camera unit  140  photographs image data, and includes a camera sensor (not shown) for converting a photographed optical signal to an electric signal and a signal processor (not shown) for converting an analogue image signal photographed by the camera sensor to digital data. It is assumed that the camera sensor is a Charge-Coupled Device (CCD) sensor or a Complementary Metal Oxide Sensor (CMOS) sensor, and the signal processor can be implemented in a Digital Signal Processor (DSP). The camera sensor can be integrally or separately formed with the signal processor. 
     An image processor  150  performs an Image Signal Processing (ISP) for displaying an image signal output from the camera unit  140  on the touch screen unit  160 . The ISP performs a function, such as a gamma correction, an interpolation, a spatial change, an image effect, an image scale, Auto White Balance (AWB), Auto Exposure (AE), and Auto Focus (AF). Therefore, the image processor  150  processes an image signal output from the camera unit  140  frame by frame, and outputs the frame image data in accordance with a characteristic and a size of the touch screen unit  160 . The image processor unit  150  includes an image codec (not shown), and compresses the frame image data displayed on the touch screen unit  160  in a preset scheme or restores the compressed frame image data to the original frame image data. The image codec may include, for example, a Joint Photographic Experts Group (JPEG) codec, an Motion Pictures Experts Group (MPEG)4 codec, or a Wavelet codec. The image processor  150  is assumed to have an On Screen Display (OSD) function and outputs OSD data in accordance with a screen size displayed under the control of the controller  110 . 
     The touch screen unit  160  includes a display unit (not shown) and an input unit (not shown). The display unit displays an image signal output from the image processor  150  on a screen and displays user data output from the controller  110 . The input unit includes the keys for inputting number and character information and function keys for setting various functions. 
     When a touch or drag is generated in the touch screen unit  160  while the input of the key, in which a p consonant is arranged, among the keys included in the touch screen unit  160  is maintained, the multiple keys are activated through the virtual area for inputting a vowel. The virtual area may include not only the input unit but also the display unit in the touch screen unit  160 . 
       FIGS. 2A to 2D  illustrate the operation of inputting characters in the portable terminal according to the present invention. An example of an operation of inputting Korean characters will be described herein, as well as the input unit of the touch screen unit for inputting characters includes keys in which the Korean consonants are arranged. 
       FIGS. 2A to 2D  will be described with reference to  FIG. 1  in detail. 
     Referring to  FIG. 2A , when a key, in which a consonant is arranged, among the multiple keys included in the input unit of the touch screen unit  160  is input in the single input mode of the portable terminal in step  210 , the controller  110  detects the input of the key and displays the consonant arranged in the input key on the display unit in step  220 . 
     However, when a touch or drag is generated in the touch screen unit  160  during the maintenance of the input of the key in which the consonant is arranged, the controller  110  detects the generation of the touch or drag in step  230  and processes step  240  for switching the single input mode to the multi-input mode of the portable terminal. 
     Specifically, in step  240 , the switching from the single input mode to the multi-input mode is notified to the user by the controller  110  through at least one of an indicator such as an icon, a haptic effect, an alarming sound, and a change of a background image of the input mode, which are discriminated from those of the single input mode. 
     The touch screen unit  160  is activated by the controller  110  in step  240  as the virtual area for inputting a vowel, and the virtual area is divided into the multiple regions based on the position of the key in which the consonant input in step  220  is arranged. 
     Further, in step  240 , the controller  110  may visually display the virtual area divided into the multiple regions in accordance with the selection of the user. 
     The controller  110  vaguely or transparently displays data such as a character, a number, and a special sign, arranged on the multiple keys included in the touch screen unit  160 , which is activated as the virtual area, and displays the type of corresponding vowels which can be input through a touch or drag on each of the multiple regions divided from the virtual area. 
     The division of the virtual area into the right region and the lower region is exemplified for description. However, the virtual area may be divided into the left region and the lower region according to user convenience, and in this regard, the left region may perform the identical function of the input of a vowel through a touch and/or drag in the right region. 
     In step  240 , when the touch or drag is generated in the right region, the controller  110  detects the generation of the touch or drag and determines which of the touch and the drag is generated in step  250 . 
     Referring to  FIG. 2B , when a touch is generated in the right region, the controller  110  detects the generation of the touch in step  251 , and combines the vowel ‘ ’ with the consonant input in step  220  and processes step  252  of displaying the combined character on the display unit of the touch screen unit  160 . 
     When the drag is generated in the right region, the controller  110  detects the generation of the drag and determines the type of the generated drag in step  253 . 
     When the straight drag is generated in the right region, the controller  110  detects the generation of the straight drag in step  254  and processes step  255 , in which the controller  110  combines the vowel ‘ ’ with the consonant and displays a combined character on the display unit of the touch screen unit  160 . The following is also performed in step  255  by the controller  110 . 
     Specifically, when the straight drag in the left direction is generated in the right region, the controller  110  detects such a straight drag and combines the vowel ‘ ’ with the consonant and displays a combined character on the display unit of the touch screen unit  160 . 
     When the straight drag in the right direction is continuously generated twice in the right region, the controller  110  detects such a straight drag and combines the vowel ‘ ’ with the consonant and displays a combined character on the display unit of the touch screen unit  160 . 
     When the straight drag in the left direction is continuously generated two times in the right region, the controller  110  detects such a straight drag and combines the vowel ‘ ’ with the consonant and displays a combined character on the display unit of the touch screen unit  160 . 
     When the half-ellipsoidal drag is generated in the right region, the controller  110  detects such a half-ellipsoidal drag in step  256  and processes step  257 , in which the controller  110  combines the vowel ‘ ’ with the consonant and displays a combined character on the display unit of the touch screen unit  160 . 
     Further, in step  257 , when the half-ellipsoidal drag in the right direction is generated in the right region, the controller  110  detects such a half-ellipsoidal drag and combines the vowel ‘ ’ with the consonant and displays a combined character on the display unit of the touch screen unit  160 . 
     When both the touch and the drag are generated in the right region, the controller  110  detects the touch and the drag in step  258  and processes step  259 . 
     In step  259 , when the straight drag in the left direction is generated twice and then a touch is generated in the right region, the controller  110  detects the generation of the drags and the touch, and combines the vowel ‘ ’ with the consonant and displays a combined character on the display unit of the touch screen unit  160 . 
     Further, in step  259 , when the straight drag in the right direction is generated twice in the right region and then the touch is generated, the controller  110  detects the generation of the drags and the touch, and combines the vowel ‘ ’ with the consonant and displays a combined character on the display unit of the touch screen unit  160 . 
     As described above, when the vowel is input through the touch and/or drag on the right region, the controller  110  displays the corresponding vowel in a form of a text balloon in an upper side of the key, in which the consonant is arranged and of which the input is maintained, to enable the user to identify the input vowel. 
     The half-ellipsoidal drag in the left direction or the half-ellipsoidal drag in the right direction may be performed in a clockwise direction or in a counterclockwise direction. 
     When the touch or drag is generated in the lower region in step  240  of FIG.  2 A, the controller  110  detects the generation of the touch or the drag and determines which of the touch and the drag is generated in the lower region in step  260 . 
     Referring to  FIG. 2C , when a touch is generated in the lower region, the controller  110  detects the generation of the touch, and combines the vowel ‘ ’ with the consonant input in step  220  and displays a combined character on the display unit of the touch screen unit  160 . 
     When the drag is generated in the lower region, the controller  110  detects the generation of the drag in step  263  and processes step  264 , in which the controller  110  combines the vowel ‘ ’ with the consonant and displays a combined character on the display unit of the touch screen unit  160 . 
     Further, in step  264 , when the straight drag in an upward direction is generated in the lower region, the controller  110  detects such a straight drag, and combines the vowel ‘ ’ with the consonant and displays a combined character on the display unit of the touch screen unit  160 . 
     When the straight drag in a downward direction is generated twice in the lower region, the controller  110  detects the straight drags, and combines the vowel ‘ ’ with the consonant and displays a combined character on the display unit of the touch screen unit  160 . 
     When the straight drag in an upward direction is generated twice in the lower region, the controller  110  detects the straight drags, and combines the vowel ‘ ’ with the consonant and displays a combined character on the display unit of the touch screen unit  160 . 
     As described above, when the vowel is input through the touch and/or drag in the right region, the controller  110  displays the corresponding vowel in a form of a text balloon in an upper side of the key, in which the consonant is arranged and of which the input is maintained, to enable the user to identify the input vowel. 
     When the touch or drag is generated in the right region and the lower region in step  240  of  FIG. 2A , the controller  110  detects the generation of the touch or the drag and determines which of the touch and the drag is generated in step  270 . 
     Referring to  FIG. 2D , when a touch is generated in the right region and the lower region, the controller  110  detects the generation of the touch in step  271  and processes step  272 , in which the controller  110  combines the vowel ‘ ’ with the consonant and displays a combined character on the display unit of the touch screen unit  160 . 
     In this regard, it is possible to input the vowel regardless of an order of the corresponding regions in which the touch is generated. 
     Otherwise, when the drag is generated in the right region and the lower region, the controller  110  detects the drags in step  273  and processes step  274 . 
     In step  274 , when the straight drag in a downward direction is generated in the lower region and then the straight drag in the left direction is generated in the right region, the controller  110  detects the straight drags, and combines the vowel ‘ ’ with the consonant and displays a combined character on the display unit of the touch screen unit  160 . 
     Otherwise, in step  274 , when the straight drag in an upward direction is generated in the lower region and then the half-ellipsoidal drag in the right direction is generated in the right region, the controller  110  detects the drags, and combines the vowel ‘ ’ with the consonant and displays a combined character on the display unit of the touch screen unit  160 . 
     Further, in step  274 , when the straight drag in an upward direction is generated in the lower region and then the straight drag in the right direction is generated in the right region, the controller  110  detects the straight drags, and combines the vowel ‘ ’ with the consonant and displays a combined character on the display unit of the touch screen unit  160 . 
     As described above, when the vowel is input through the drag on the corresponding region, it is possible to input the vowels regardless of an order of the corresponding regions in which the drag is generated. 
     Otherwise, when the touch and the drag are generated in the right region and the lower region, the controller  110  detects the touch and the drag in step  275  and processes step  276 . 
     In step  276 , when the straight drag in a downward direction is generated in the lower region and then a touch is generated in the right region, the controller  110  detects the drag and the touch, and combines the vowel ‘ ’ with the consonant and displays a combined character on the display unit of the touch screen unit  160 . 
     When the straight drag in an upward direction is generated in the lower region and then a touch is generated in the right region, the controller  110  detects the drag and the touch, and combines the vowel ‘ ’ with the consonant and displays a combined character on the display unit of the touch screen unit  160 . 
     When the straight drag in a downward direction is generated in the lower region and then the half-ellipsoidal drag in the left direction is generated in the right region, the controller  110  detects the drags, and combines the vowel ‘ ’ with the consonant and displays a combined character on the display unit of the touch screen unit  160 . 
     The half-ellipsoidal drag in the left direction and the half-ellipsoidal drag in the right direction may be performed in a clockwise direction or a counterclockwise direction. 
     When the vowel is input through the touch and the drag on the corresponding region, it is possible to input the vowels regardless of an order of the touch and the drag generated in the corresponding region and an order of the corresponding regions in which the touch and the drag are generated. 
     When the vowel is input through the touch and the drag on the right region and the lower region, the controller  110  displays the corresponding vowel in a form of a text balloon in an upper side of the key, in which the consonant is arranged and of which the input is maintained, to enable the user to identify the input vowel. 
     In  FIG. 2A , when the input of the key, in which the consonant is arranged and of which the input is maintained, is terminated during the execution of the multi-input mode, the controller  110  detects the termination of the input of the key, terminates the multi-input mode, and switches the multi-input mode to the single input mode in step  280 . 
     In the switched single input mode, it is possible to add a final sound (consonant) to the character formed by the combination of an initial sound (consonant) and a middle sound (vowel) to input the character. 
     When the controller  110  determines that the input mode is terminated, the controller  110  detects the termination of the input mode and terminates the input mode in step  290 . 
       FIGS. 3A to 3B  illustrate the operation of inputting the character shown in  FIG. 2A to 2D .  FIGS. 3A to 3B  describe an example of the clockwise directional half-ellipsoidal drag in the left direction and the clockwise directional half-ellipsoidal drag in the right direction. 
     Further,  FIGS. 3A to 3B  illustrate an example in which the virtual area in the multi-input mode is divided into the right region and the lower region. Throughout  FIGS. 3A and 3B , unless it is stated otherwise, the finger on the left of each figure is the one finger  300 , and the finger on the right of each figure is the another finger  400 . 
     In FIG.  3 A(a), when the user inputs the key in which the consonant ‘ ’ is arranged on the input unit  162  of the touch screen unit  160  by using one finger  300 , the input consonant ‘ ’ is displayed on the display unit  161 . 
     In FIG.  3 A(b), in the multi-input mode, when the user touches a right region  171  with another finger  400  while maintaining the input of the key in which the consonant ‘ ’ is arranged with the one finger  300 , the character ‘ ’ is displayed on the display unit  161 . 
     In FIG.  3 A(c), in the multi-input mode, when the user touches a lower region  172  with another finger  400  while maintaining the input of the key in which the consonant ‘ ’ is arranged with the one finger  300 , the character ‘ ’ is displayed on the display unit  161 . 
     In FIG.  3 A(d), in the multi-input mode, when the user performs a drag in the right direction in the right region  171  with another finger  400  while maintaining the input of the key in which the consonant ‘ ’ is arranged with the one finger  300 , the character ‘ ’ is displayed on the display unit  161 . 
     In FIG.  3 A(e), in the multi-input mode, when the user performs a drag in the left direction in the right region  171  with another finger  400  while maintaining the input of the key in which the consonant ‘ ’ is arranged with the one finger  300 , the character ‘ ’ is displayed on the display unit  161 . 
     In FIG.  3 A(f), in the multi-input mode, when the user first touches (1) the lower region  172  and then touches (2) the right region  171  by using another finger  400  while maintaining the input of the key in which the consonant ‘ ’ is arranged with the one finger  300 , the character ‘ ’ is displayed on the display unit  161 . 
     In FIG.  3 A(g), when the user performs a half-ellipsoidal drag in the left direction in the right region  171  by using another finger  400  while maintaining the input of the key in which the consonant ‘ ’ is arranged with the one finger  300 , the character ‘ ’ is displayed on the display unit  161 . 
     In FIG.  3 A(h), in the multi-input mode, when the user performs a half-ellipsoidal drag in the right direction in the right region  171  by using another finger  400  while maintaining the input of the key in which the consonant ‘ ’ is arranged with the one finger  300 , the character ‘ ’ is displayed on the display unit  161 . 
     In FIG.  3 A(i), in the multi-input mode, when the user first performs a drag (1) in a downward direction in the lower region  172  and then touches (2) the right region  171  by using another finger  400  while maintaining the input of the key in which the consonant ‘ ’ is arranged with the one finger  300 , the character ‘ ’ is displayed on the display unit  161 . 
     In FIG.  3 B(j), in the multi-input mode, when the user first performs a drag (1) in a downward direction in the lower region  172  and then performs a drag (2) in the left direction in the right region  171  by using another finger  400  while maintaining the input of the key in which the consonant ‘ ’ is arranged with the one finger  300 , the character ‘ ’ is displayed on the display unit  161 . 
     In FIG.  3 B(k), in the multi-input mode, when the user first performs a drag (1) in an upward direction in the lower region  172  and then performs a half-ellipsoidal drag (2) in the right direction in the right region  171  by using another finger  400  while maintaining the input of the key in which the consonant ‘ ’ is arranged with the one finger  300 , the character ‘ ’ is displayed on the display unit  161 . 
     In FIG.  3 B( 1 ), in the multi-input mode, when the user performs a drag twice (1), (2) in the right direction in the right region  171  by using another finger  400  while maintaining the input of the key in which the consonant ‘ ’ is arranged with the one finger  300 , the character ‘ ’ is displayed on the display unit  161 . 
     In FIG.  3 B(m), in the multi-input mode, when the user performs a drag twice (1), (2) in the left direction in the right region  171  by using another finger  400  while maintaining the input of the key in which the consonant ‘ ’ is arranged with the one finger  300 , the character ‘ ’ is displayed on the display unit  161 . 
     In FIG.  3 B(n), in the multi-input mode, when the user performs a drag in a downward direction in the lower region  172  by using another finger  400  while maintaining the input of the key in which the consonant ‘ ’ is arranged with the one finger  300 , the character ‘ ’ is displayed on the display unit  161 . 
     In FIG.  3 B(o), in the multi-input mode, when the user performs a drag in an upward direction in the lower region  172  by using another finger  400  while maintaining the input of the key in which the consonant ‘ ’ is arranged with the one finger  300 , the character ‘ ’ is displayed on the display unit  161 . 
     In FIG.  3 B(p), in the multi-input mode, when the user first performs a drag in an upward direction in the lower region  172  and then touches the right region  171  by using another finger  400  while maintaining the input of the key in which the consonant ‘ ’ is arranged with the one finger  300 , the character ‘ ’ is displayed on the display unit  161 . 
     In FIG.  3 B(q), in the multi-input mode, when the user performs a drag twice (1), (2) in a downward direction in the lower region  172  by using another finger  400  while maintaining the input of the key in which the consonant ‘ ’ is arranged with the one finger  300 , the character ‘ ’ is displayed on the display unit  161 . 
     In FIG.  3 B(r), in the multi-input mode, when the user performs a drag twice (1), (2) in an upward direction in the lower region  172  by using another finger  400  while maintaining the input of the key in which the consonant ‘ ’ is arranged with the one finger  300 , the character ‘ ’ is displayed on the display unit  161 . 
     In FIG.  3 B(s), in the multi-input mode, when the user first performs a drag twice (1), (2) in the left direction in the right region  171  and then touches (2) the right region  171  by using another finger  400  while maintaining the input of the key in which the consonant ‘ ’ is arranged with the one finger  300 , the character ‘ ’ is displayed on the display unit  161 . 
     In FIG.  3 B(t), in the multi-input mode, when the user first performs a drag twice (1), (2) in the right direction in the right region  171  and then touches (3) the right region  171  by using another finger  400  while maintaining the input of the key in which the consonant ‘ ’ is arranged with the one finger  300 , the character ‘ ’ is displayed on the display unit  161 . 
       FIGS. 4A and 4B  illustrate an operation of inputting characters in a portable terminal according to the present invention. An example of an extraction of a Chinese character according to an operation of inputting an English character will be described, and an input unit of a touch screen unit for inputting characters includes keys in which English character consonants are arranged. 
     Referring to  FIGS. 4A and 4B , when a key, in which a predetermined consonant is arranged, among multiple keys included in the input unit of the touch screen unit  160  is input in step  401  which is a single input mode of the portable terminal, the controller  110  detects the input of the key and displays the consonant arranged in the input key on a display unit of the touch screen unit  160  in step  402 . 
     However, when a touch or a drag is generated in the input unit of the touch screen unit  160  during the maintenance of the key input in which the consonant is arranged, the controller  110  detects the generation of the touch or drag in step  403  and processes step  404  for switching the single input mode of the portable terminal to a multi input mode. 
     In step  404 , the controller  110  notifies a user of the switching from the single input mode to the multi input mode through at least one of an indicator such as an icon, a haptic effect, an alarming sound, and change of a background image of the input mode, which are discriminated from those of the single input mode. 
     Further, in step  404 , the controller  110  activates the input unit of the touch screen unit  160  as a virtual area for inputting vowels. The virtual area includes all remaining regions other than the key in which the consonant input in step  402  is arranged. 
     Further, in step  404 , the controller  110  transparently displays data such as a character, a number, and a special sign, arranged on the multiple keys included in the input unit of the touch screen unit  160 , which is activated as the virtual area, and displays the type of corresponding vowels which can be input through a touch or a drag direction on the virtual area. 
     When a straight drag in a left direction is generated in step  404 , the controller  110  detects the generation of the straight drag in a left direction in step  405  and processes step  406  for inputting and displaying a vowel ‘a’ next to the input consonant. 
     When a straight drag in a right direction is generated in step  404 , the controller  110  detects the generation of the straight drag in a right direction in step  407  and processes step  408  for inputting and displaying a vowel ‘e’ next to the consonant input and displayed in the display unit of the touch screen unit  160  in step  402 . 
     When a touch is generated in step  404 , the controller  110  detects the generation of the touch in step  409  and processes step  410  for inputting and displaying a vowel ‘i’ next to the consonant input and displayed in the display unit of the touch screen unit  160  in step  402 . 
     When a straight drag in an upward direction is generated in step  404 , the controller  110  detects the generation of the straight drag in an upward direction in step  411  and processes step  412  for inputting and displaying a vowel ‘o’ next to the consonant input and displayed in the display unit of the touch screen unit  160  in step  402 . 
     When a straight drag in a downward direction is generated in step  404 , the controller  110  detects the generation of the straight drag in a downward direction in step  413  and processes step  414  for inputting and displaying a vowel ‘u’ next to the consonant input and displayed in the display unit of the touch screen unit  160  in step  402 . 
     When an English character is input through the multi input mode, the controller  110  detects the input of the English character and displays a candidate group of Chinese characters corresponding to the input English character. When a predetermined Chinese character is selected from the displayed candidate group of the Chinese characters, the controller  110  detects the selection of the predetermined Chinese character and processes step  415  for changing the English character displayed on the display unit of the touch screen unit to the selected Chinese character and displaying the changed Chinese character. 
     When the maintenance of the key input in which the consonant is arranged is terminated during the multi input mode, the controller  110  detects the termination of the key input, terminates the multi input mode, and switches the multi input mode to the single input mode in step  416 . 
     In the switched single input mode, it is possible to add a consonant to the character input in the multi input mode and input the characters. 
     When it is determined that the input mode is terminated, the controller  110  detects the termination of the input mode and terminates the input mode in step  417 . 
       FIG. 5  illustrates an operation of inputting characters of  FIGS. 4A and 4B . 
     In  FIG. 5 , when a key in which a consonant ‘b’ is arranged is first input by a finger  300  through the input unit of the touch screen unit  160  including the keys in which only English consonants are arranged in the single input mode, the input consonant ‘b’ is displayed on the display unit  161  of the touch screen unit  160 . 
     When a drag in a left direction by another finger  400  is generated in a region other than the key in which the consonant ‘b’ is arranged while the input of the key in which the consonant ‘b’ is arranged is maintained by the finger  300 , the single input mode is switched to the multi input mode and a vowel ‘e’ is displayed next to the consonant ‘b’ displayed on the display unit  161 . 
     When a touch by another finger  400  is generated in a region other than the key in which the consonant ‘b’ is arranged while the input of the key in which the consonant ‘b’ is arranged is maintained by the finger  300 , a vowel ‘i’ is displayed next to the characters ‘be’ displayed on the display unit  161 . 
     When the character ‘bei’ is displayed on the display unit  161 , a candidate group of Chinese characters corresponding to the character ‘bei’ is displayed on a predetermined region of the touch screen unit  160 . 
     Then, when an English consonant has to be input, the multi input mode is switched to the single input mode according to the termination of the input of the key in which the consonant ‘b’ is arranged so that a corresponding English consonant can be input in the single input mode. 
     In the foregoing method of inputting the English vowels, the vowel ‘a’ is input through a drag in a left direction, the vowel ‘e’ is input through a drag in a right direction, the vowel ‘i’ is input through a touch, the vowel ‘o’ is input through a drag in an upward direction, and the vowel ‘u’ is input through a drag in a downward direction, but the aforementioned input scheme may be changed by a user. 
     While the present invention has been shown and described with reference to certain embodiments and drawings thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.