KR101083786B1 - Apparatus and method for entering characters - Google Patents

Apparatus and method for entering characters Download PDF

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Publication number
KR101083786B1
KR101083786B1 KR1020100078969A KR20100078969A KR101083786B1 KR 101083786 B1 KR101083786 B1 KR 101083786B1 KR 1020100078969 A KR1020100078969 A KR 1020100078969A KR 20100078969 A KR20100078969 A KR 20100078969A KR 101083786 B1 KR101083786 B1 KR 101083786B1
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KR
South Korea
Prior art keywords
character
input
key
characters
reference character
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KR1020100078969A
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Korean (ko)
Inventor
서재형
Original Assignee
서재형
주식회사 오디글로벌
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Priority to KR1020100078969A priority Critical patent/KR101083786B1/en
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Publication of KR101083786B1 publication Critical patent/KR101083786B1/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
    • G06F3/023—Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes
    • G06F3/0233—Character input methods
    • G06F3/0234—Character input methods using switches operable in different directions
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
    • G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
    • G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
    • G06F3/04886—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures by partitioning the display area of the touch-screen or the surface of the digitising tablet into independently controllable areas, e.g. virtual keyboards or menus
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/23—Construction or mounting of dials or of equivalent devices; Means for facilitating the use thereof

Abstract

The present invention relates to an apparatus and method for inputting a character using an input key in which a plurality of character sets are assigned to one key, such as a keypad of a small electronic device. The character input apparatus according to the present invention includes a character input unit, a display unit, and a control unit for transmitting a signal transmitted from the character input unit to the display unit, wherein the character input unit includes a reference character for each one or more characters as a group And a plurality of assigned input keys and direction keys for inputting characters other than the reference characters assigned to the corresponding input keys. When using such a character input device, a timer waiting time or a moving key operation in the conventional character input method is unnecessary, thereby reducing errors or typos, and reducing the overall number of key presses, thereby improving input efficiency. By improving the spatial constraints on the key arrangement of the keyboard in small devices, it is advantageous to expand the physical area of the key to reduce the typo during key operation to improve the overall input efficiency.

Description

Character input device and method {APPARATUS AND METHOD FOR ENTERING CHARACTERS}

The present invention relates to a character input device and a character input method of a small electronic device such as a mobile phone, navigation, remote control, and more particularly, to input characters such as a keypad or a touch screen and a touch panel in which a plurality of character sets are assigned to one key. An apparatus and method for

In general, small handheld terminals such as mobile phones, navigation devices, and remote controllers have to enter characters with a few input keys of 10 to 12 due to space constraints. In this case, most languages have a large number of unit letters, so it is practically impossible to assign one letter per input key.

In a portable terminal equipped with a hard keypad as a conventional character input device, Korean / English characters are composed of a 3 X 4 keypad having 12 character input keys except for special keys such as a menu key or a direction key. In general, a form in which unit letters for expressing a corresponding language are classified into 1 to 4 is displayed.

In the case of inputting a character using such a character input device, the input efficiency must be repeated several times until the desired character is input unless the desired character is assigned as the first character of the corresponding input key. Falls.

In addition, in the input device in which the timer operates during the character input process or the movement of the input position, if the desired time is exceeded, the character that is not desired but already input is recognized as input, and thus the operation of correcting and inputting again must be repeated. Input efficiency is low.

For example, if 'abc' is assigned to one input key, in order to enter the 'aaa' character, press the input key once to select 'a', and then enter a navigation key or a timer that recognizes the character. Wait until the expiration time to complete the 'a' input, and repeat this process twice to complete the input for 'aaa', which increases the number of key presses or add the timer waiting time Will fall.

On the other hand, small electronic devices such as iPhones, iPads, and netbooks employ QWERTY keyboards, such as computer keyboards, in which one input letter is assigned to each input key. Since they must be placed in the space, the size of each input key becomes small, and errors or typos frequently occur during input. In order to correct such a typo, it is troublesome to delete and re-enter a wrongly input character by using a moving key and / or a delete key or a back space key.

It is an object of the present invention to provide a character input device and method for reducing the number of inputs and input errors in a small electronic device such as a portable terminal.

The gist of the present invention related to the above-mentioned problem is as follows.

(1) a text input device including a text input part, a display part, and a control part for transmitting a signal transmitted from the text input part to the display part, wherein the text input part includes three or more odd characters including a reference letter for each of them; And a plurality of input keys assigned to the group and direction keys for inputting characters other than the reference characters assigned to the corresponding input keys, wherein the reference characters are located in the middle of the character group, and the direction keys are the reference characters. To correspond to the characters located in the opposite direction to input the characters located in the opposite direction with respect to, and after the display of characters other than the reference characters by the direction key, before the definite input, again for the reference character input or In order to input a character other than the reference character, the direction keys can be continuously pressed. The character input device to.

(2) Characters other than the reference character in the input key are disposed in at least one direction of up, down, left, and right based on the reference character, and the direction key is used to select and input characters other than the reference character. Character input device according to the above (1), characterized in that consisting of at least one key, lower, left, right.

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(5) The character input apparatus according to (1), wherein the character input unit is one of a keypad, a keyboard or a touch screen, and a touch panel.

(6) The character input device according to (1), wherein the signal transmission to the display unit is made by wire or wireless.

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(8) A character input method using a plurality of input keys in which at least one character including a reference character is assigned to each group and a direction key for inputting characters other than the reference character assigned to the corresponding input key, wherein When the input key is pressed, the reference letter of the corresponding input key is displayed, and subsequently, by pressing the corresponding input key or another input key, the previously input reference letter is definitely inputted, or by pressing the direction key, other than the reference letter of the corresponding input key. A character arranged in a direction indicated by a corresponding direction key among characters is selected and inputted, wherein the character group is assigned to a group of three or more odd characters, the reference character is located in the middle of the character group, and the direction key. Characters located in the opposite direction to input the characters located in the opposite direction with respect to the reference character The direction keys are located in correspondence with the direction keys, and after the display of characters other than the reference characters by the direction keys, before the definite input, the direction keys can be continuously pressed again for input of the reference characters or for input of characters other than the reference characters. Character input method.

(9) Characters other than the reference character in the input key are disposed in one or more directions of up, down, left, and right based on the reference character, and the direction key is used to select and input characters other than the reference character. Character input method according to the above (8), characterized in that consisting of one, more than one key.

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In the case where a plurality of characters are assigned to a single input key in a group, the timer wait time or movement key operation in the conventional character input method is unnecessary when the method according to the present invention is followed. Input efficiency can be improved by reducing the overall number of key presses.

In addition, when the input method according to the present invention is applied to a QWERT keyboard in an existing small device, the key operation is improved by extending the physical area of the key by improving the spatial constraints on the key arrangement of the keyboard in the small device. It is advantageous because the input efficiency can be improved by reducing the typo.

In addition, when the character input device according to the present invention is implemented as a touch screen or a touch panel, the character input may be performed more effectively by using a drag function on the touch screen and the touch panel instead of the direction keys.

1 is a block diagram of a character display device according to the present invention;
2 is a block diagram of a keypad input character input unit according to an embodiment of the present invention.
3 is a block diagram of a character input unit in the form of a qwerty keyboard according to another embodiment of the present invention.
4 is a block diagram of a character input unit in the form of a qwerty keyboard according to another embodiment of the present invention.
5 is a block diagram of a character input unit having a plurality of direction keys according to an embodiment of the present invention.
6 is a flowchart illustrating a character input process according to the present invention.
7 is a table comparing the input method according to the present invention and the conventional input method.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same or equivalent reference numerals are given the same or similar reference numerals. Also, throughout the specification, when a part "contains" a certain component, it excludes other components unless otherwise stated. It does not mean that it may further include other components.

1 is a block diagram of a character display apparatus according to the present invention. The text display device includes a text input unit 100, a display unit 600, and a controller 500 for transmitting an input signal transmitted from the text input unit to the display unit. In this case, the signal transmission to the display unit may be performed in a wired manner physically in the same device as a mobile phone or wirelessly in a physically separated state such as a remote controller.

The character input unit 100 may be configured in the form of a keypad, a qwerty keyboard or a touch screen, or a touch panel. When the character input unit is implemented in the form of a touch screen or a touch panel, the character input unit 100 may also simultaneously perform the role of the display unit 600. The arrangement of the input keys may be the same or arbitrarily arranged as the keypad or the QWERTY keyboard and can be understood with reference to the embodiments of the present invention for the hard keypad or QWERTY keyboard described below. In addition, the character group assigned to each input key may be variable.

First, the configuration of the character input unit according to the present invention will be described with reference to FIGS. 2 to 4.

2 is a block diagram of a character input unit 100 in the form of a keypad according to an embodiment of the present invention. The illustrated keypad is 3 X 4 used in a typical mobile phone as an example, but is not limited thereto. The keypad may be appropriately selected according to the size of other small electronic devices accompanied with a character input device such as a remote controller or a PDA. In addition, in the present embodiment, but illustrated in English alphabet reference, but is not limited to this, the principles of the present invention described below can be equally applied to other languages, including Korean. For convenience of explanation, other keys on the keypad such as a menu key, a call key, a move key, an confirm key, and the like are omitted.

The character input unit 100 may include a plurality of input keys 110 in which one or more characters are assigned to each group, including reference characters, and direction keys for inputting characters other than the reference characters assigned to the corresponding input keys. 120).

A character group assigned to each of the input keys 110 is classified in consideration of characteristics of characters constituting a language. For example, a sequence of characters, characters with the same phonetic value, characters with similar shapes, or characters with similar grammatical properties may be configured in the same group so that the user can easily recognize the characters. The number of characters assigned to each input key 110 may be selected in consideration of user recognition, visibility, number of characters of the corresponding language, the total number of input keys, and the like. It is not limited to this.

Each input key 110 is set by selecting a reference character to be displayed as a default value when the corresponding input key 110 is pressed from the corresponding character group. In this case, the setting of the reference character may preferably set the character displayed in the middle of the character group as the reference character in order to reduce the variation in the number of inputs during character input and improve the input efficiency. That is, when an odd number of characters forms a group, a character located in the middle is assigned as a reference character, and when an even number of characters forms a group, a position obtained by dividing the number of characters by 2 or the next position may be assigned as a reference character. For example, if the character group consists of one, the corresponding character becomes a reference character, if the character group consists of two, the left character or the right character may be set as the reference character.

In addition, when there are three or more character groups, it is preferable to form an odd number of character groups. The reason for this is that the character to be displayed when inputting a character other than the reference character among the character groups using the direction key 120 to be described later is used. This is because the input efficiency can be increased by minimizing the moving distance of.

In the embodiment according to FIG. 2, the character group for each input key 110 is '.qz', 'abc', 'def', 'ghi', 'jkl', 'mno', 'prs', 'tuv' , 'wxy' is illustrated, and the reference character for each input key 110 is set to the middle character.

When the input key 110 is pressed in the text input mode, the reference character of the corresponding input key 110 is displayed on the display unit 600 by the controller 500. If the corresponding input key or another input key is pressed again other than the direction key described later in the state where the reference character is displayed, the previously displayed reference character is input definitely. For example, when the 'abc' input key 110a is pressed, the reference character 'b' is displayed on the display unit 600. In this state, the input key 110a is pressed to input 'bb' or another input key 110b. Press to display bh. In this case, the letter 'b' previously displayed by the operation of the input key 110a is decidedly input.

The lower end of the character input unit 100 is provided with a direction key 120 for inputting a character other than the reference character of the character group assigned to each input key 110. Preferably, the direction key 120 is configured as a pair (120a, 120b) to input the characters located in the opposite direction with respect to the reference character to display the characters other than the reference character in the long sentence input process Input efficiency can be improved by minimizing the average number of presses on the key. In the embodiment of Fig. 2, paired direction keys 120a and 120b are formed in the left and right directions.

In this case, the direction key 120 selects and inputs a character located in the direction indicated by the corresponding direction key based on the reference letter of the input key. For example, when the input key 110a is pressed to display the center reference character 'b' among the 'abc' character groups on the display unit 600, when the left direction key 120a is pressed, the left side of the reference character 'b' is located. The letter 'a' is displayed, and when the right direction key 120b is pressed, the letter 'c' located on the right side of the reference letter is displayed.

3 is a block diagram of a character input unit 200 in the form of a qwerty keyboard according to another embodiment of the present invention. The overall character arrangement order for English characters is illustrated with reference to a conventional QWERTY keyboard. As in the embodiment of Fig. 2, input keys 210 and direction keys 220 (220a, 220b) are provided, with each input key 210 assigned one or three groups of characters and a reference to that key. The character is set. In this case, the allocation method of the character group for each input key is not particularly limited. The operation contents of the input key 210 and the direction key 220 are the same as those described with reference to FIG. 2.

4 is a block diagram of a character input unit 300 in the form of a qwerty keyboard according to another embodiment of the present invention. Unlike in FIG. 3, the arrangement of the input keys 310 is performed in a vertical manner, and the direction keys 320 are arranged in the up-down direction key pairs 320a and 320b according to the arrangement of the character groups assigned to the respective input keys 310. Implemented. The operation contents of the input key 310 and the direction key 320 are basically the same as those described in FIG. 2, and the corresponding input key is operated by pressing the input key 310 and then operating the up and down direction keys 320a and 320b. Characters located in the upward or downward direction can be input from the reference character of the.

3 and 4 has a low input efficiency when compared to a conventional large-sized QWERTY keyboard, but in the case of implementing a QWERTY keyboard in a small size, the QWERTY keyboard is simply reduced. In this case, errors and typos can be prevented during the key press operation, thereby improving the overall input efficiency.

Next, the character input process according to the present invention will be described with reference to FIG.

6 is a flowchart illustrating a character history process according to the present invention. First, the controller 500 checks whether a character input mode is selected by a user's key operation (S10). The text input mode is a mode for inputting a text, a memo, a message, or other text.

If the text input mode is not selected, the controller 500 performs a predetermined mode of the corresponding electronic device (S100). If the text input mode is selected, the controller 500 displays a text input window on the display 600 (S20).

After displaying the text input window, the controller 500 checks whether the input keys 110, 210, and 310 are pressed by a user's key operation (S30), and displays the reference text of the corresponding input key in the text input window. It is displayed (S40).

In the state in which the reference character is displayed, the control unit 500 checks whether the direction keys 120, 220, and 320 are pressed (S50), and the character located in the direction indicated by the direction key in the character group to which the reference character belongs. To display (S60). Subsequently, when another corresponding or another input key is pressed, the character located in the direction indicated by the corresponding direction key displayed is determined (S80). In this case, when the corresponding or other input key is not pressed again, the controller 500 repeats the process of checking whether the direction keys 120, 220, and 320 are pressed again (S50). That is, after the display of characters other than the reference character by the direction key and before definite input, characters other than the reference character or another reference character can be input again.

If the direction key is not pressed, the previously displayed reference letter is decisively inputted when another corresponding or other input key is pressed (S90).

A series of characters is input by repeating the above steps S30 to S90.

Next, a result of comparing the input method according to the present invention with the existing input method using a 3 x 4 hard keypad as an example is summarized in FIG. The comparison of the input method was performed by calculating the total and average of the number of key operations for a total of 27 cases that can be input using the 'abc' character group key, and comparing the sums and averages.

In this case, both input methods are assumed as follows for convenience of comparison. (i) It is assumed that both the existing method and the present invention assume that the number of character groups assigned to each input key (3) and the content are the same (see FIG. 2) for the English characters (ii). After displaying the representative character belonging to the character group according to the general method, press the input key repeatedly to move sequentially to the next character belonging to the character group. When the timer operates and the set time is exceeded, the displayed character is automatically entered. Or a character displayed by a moving key input is assumed. (Iii) In the conventional input method, a representative character is set first in a character group, and in the present invention, a reference character corresponding to the representative character is located at the center of the character group. Each was assumed to be set.

In Fig. 7, the symbol P is for pressing the character input key; Symbol T is an operation of waiting for a time required to recognize and input a character displayed by a timer operation according to an existing input method; Symbols L and R respectively indicate an operation of pressing a direction key to input characters other than the reference characters according to the input method according to the present invention. In addition, in the conventional input method, the timer wait operation T is counted as the number of key presses as it corresponds to the movement key operation for character input.

Referring to FIG. 7, in the case of inputting 27 strings in which a, b, and c characters are sequentially combined according to the existing input method, a total of 243 times and an average of 9 key presses are required. According to the input method of the invention, only a total of 135 key presses and 5 average key presses were required. That is, the input method of the present invention can confirm the key press operation reduction effect of about 45% = (243-135) / 243 * 100 compared to the conventional method. In this case, when the input wait time of the conventional method is calculated as 1 second, the average time of 4 seconds in inputting three character strings can be shortened.

In addition, in the case of the conventional character input method, the key press operation minimum value and the maximum value are 6 times and 12 times, respectively, depending on the type of character string, the number of key press operation varies greatly, but in the input method according to the present invention, the minimum value is 3 times maximum value. The six-circuit variation is relatively small, which shows that the string input efficiency is superior to the conventional method.

The foregoing descriptions relate to specific embodiments of the present invention, but the embodiments according to the present invention are not to be understood as limiting the scope of the present invention or the matters disclosed for the purpose of description, and those of ordinary skill in the art. Those skilled in the art should understand that various changes and modifications can be made without departing from the spirit of the present invention.

For example, in relation to the physical form of the character input unit, as a modified embodiment of the present invention, instead of implementing the character input unit in the form of a hard keypad or keyboard according to FIGS. The direction keys 110, 210, and 310 in FIGS. 2, 3, and 4 may be omitted for inputting characters other than the reference character by using a drag function built in the touch screen and the touch panel. For example, in a text input unit of a touch screen or touch panel type, each input key is assigned to one or more characters including a reference character, and when the input key is released, the reference character of the corresponding input key is decidedly input. On the other hand, when the drag while pressing the corresponding input key can be controlled to select the character located in the dragging direction.

In addition, referring to FIG. 5, in the arrangement direction of each character belonging to the character group in the input key and the implementation form of the direction key according to this, unlike in FIGS. 2 and 3 to 4, the reference in the input key 410 is referred to. Characters other than characters may be arranged in any one or more directions of up, down, left, and right based on the reference character, and the direction key 420 may be arranged in any one or more directions of up, down, left, and right. In this case, the operation contents of the input key and the direction key are the same as those described with reference to FIGS. 2 and 3 to 4.

Accordingly, all such modifications and variations can be understood as fall within the scope of the invention as set forth in the claims or their equivalents.

100, 200, 300, 400: character input unit
500: control unit
600: display unit
110, 210, 310, 410: Enter key
120, 220, 320, 420: direction keys

Claims (12)

A character input apparatus comprising a character input unit, a display unit, and a control unit for transmitting a signal transmitted from the character input unit to the display unit,
The character input unit includes a plurality of input keys in which three or more odd characters including a reference character are assigned to each group, and a direction key for inputting a character other than the reference character assigned to the corresponding input key,
The reference character is located in the middle of the character group;
The direction key is located to correspond to the characters located in the opposite direction to input the characters located in the opposite direction with respect to the reference character,
Character display device characterized in that the direction key can be pressed continuously for displaying the character other than the reference character by the direction key and before definite input, for input of the reference character again or for input of characters other than the reference character. .
According to claim 1, Characters other than the reference character in the input key is disposed in any one or more directions, up, down, left, right relative to the reference character, the direction key to select and input a character other than the reference character Character input device, characterized in that consisting of one or more of the keys, up, down, left, right.
delete delete The character input apparatus of claim 1, wherein the character input unit is one of a keypad, a keyboard or a touch screen, and a touch panel.
The character input apparatus of claim 1, wherein the signal transmission to the display unit is wired or wireless.
delete A character input method using a plurality of input keys in which one or more characters, including a reference character, are assigned to each group, and a direction key for inputting a character other than the reference character assigned to the corresponding input key,
When the input key is pressed, the reference letter of the corresponding input key is displayed, and the reference letter previously input is definitely input by pressing the corresponding input key or another input key, or the reference letter of the corresponding input key by pressing the direction key. Among the other characters, the character placed in the direction indicated by the corresponding direction key is selected and entered.
In the character group, three or more odd characters are assigned to the group, the reference character is located in the middle of the character group, and the direction keys are input in the opposite directions to input characters located in opposite directions with respect to the reference character. Corresponding to the characters in
Character display method characterized in that the direction key can be pressed continuously for inputting the reference character or for inputting another character other than the reference character again after definite input after displaying the character other than the reference character by the direction key. .
The display apparatus of claim 8, wherein characters other than the reference character in the input key are disposed in at least one of up, down, left, and right directions based on the reference character, and the direction key is used to selectively input characters other than the reference character. Character input method, characterized in that consisting of one or more keys up, down, left, right.
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KR1020100078969A 2010-08-16 2010-08-16 Apparatus and method for entering characters KR101083786B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017155268A1 (en) * 2016-03-07 2017-09-14 우순조 Character input method using extended keypad including target character and subsequent character, and computing device performing same
US10592105B2 (en) 2016-03-07 2020-03-17 Soon Jo Woo Character input method using extended keypad including target character and subsequent character, and computing device performing same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017155268A1 (en) * 2016-03-07 2017-09-14 우순조 Character input method using extended keypad including target character and subsequent character, and computing device performing same
US10592105B2 (en) 2016-03-07 2020-03-17 Soon Jo Woo Character input method using extended keypad including target character and subsequent character, and computing device performing same

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