JP3935125B2 - Character string input support device and program - Google Patents

Description

  The present invention relates to a character string input support device and a program, and in particular, in a state where an input screen is displayed in which a character string input to an input field is converted into another character string and displayed. The present invention relates to a character string input support device that supports column input, and a program for causing a computer to function as the character string input support device.

  In recent years, mobile phones have become highly functional and multi-functional, and along with this, there are increasing opportunities for operating keys of mobile phones to input important information such as passwords and passwords. For example, in Patent Document 1, in a mobile phone in which a secret can be set for a phone number registered in the phone book, when the password is input at the time of reading the phone book, the match / mismatch of the password is confirmed, There has been disclosed a technique for canceling a secret setting of a telephone number and displaying a telephone number registered in a telephone directory when the passwords match.

By the way, important information such as a personal identification number and password may be misused if leaked to a third party. For this reason, when important information is input to the input field, each character of the character string input as important information is generally replaced with a specific character (for example, a symbol such as “*”) and displayed. Also, in Patent Document 2, in order to prevent a personal identification number from leaking to a third party from the movement of a finger while entering the personal identification number, the number display position (array) when the personal identification number is input is changed for each user. Technology is disclosed.
JP-A-11-355417 JP 2001-282376 A

  However, when inputting important information in the input field, the method of replacing individual characters in the character string input as important information with specific characters and displaying them is highly effective in preventing leakage of important information. Since the input person cannot confirm the character string himself, there is a problem that the input error of the character string is likely to occur. In recent years, in order to improve security, the number of types of characters that can be used in character strings as important information has been increasing. However, cellular phones and PDAs (Personal Digital) are limited in the number of keys for input. In (Assistant), the input operation of characters other than frequently used characters (for example, numbers) is complicated, so that an error in inputting a character string as important information is more likely to occur.

  In general, when a character string is repeatedly input by a malicious third party, it is important to avoid the accidental matching of the input character string with a legitimate character string. At the time of input, when a character string different from a regular character string is input more than a predetermined number of times, it is often configured to reject the input of the input character string and lock the process. On the other hand, the method of displaying individual characters in the character string input as important information by replacing them with specific characters is likely to cause an error in inputting the character string as important information as described above. Even if it is a legitimate user who recognizes the error, it is often caused that the acceptance of the character string is rejected and the process is locked because the input of the regular character string is mistaken repeatedly. It was.

  The present invention has been made in consideration of the above facts, and an object of the present invention is to obtain a character string input support device and program capable of avoiding processing being locked due to an input error of a character string.

In order to achieve the above object, a character string input support device according to the invention described in claim 1 is characterized in that an input screen in which a character string input in an input field is converted into another character string and displayed in the input field is a terminal. A character string input support device that supports the input of a character string into the input field, which is performed by operating the input device of the terminal device in a state displayed on the display device of the device, to the input field When display of an already input character string that has already been input is instructed, a predetermined number of characters are selected from the already input character string, and characters other than the selected character in the already input character string are fixed. By generating a dummy character string converted into a character and displaying the generated dummy character string on the display device while sequentially selecting undisplayed characters as a dummy character string, the already input character string In a time-sharing manner It is characterized by having a character string confirmation auxiliary means to be displayed on the serial display device.

In the invention according to claim 1 , when the display of the already input character string already input to the input field is instructed, the character string confirmation assisting means selects a predetermined number of characters from the already input character string, Characters that have not been displayed as dummy character strings are generated by generating a dummy character string in which characters other than the selected character in the already entered character string are converted to a certain character and displaying the generated dummy character string on the display device. By repeating the process while selecting sequentially, the entire input character string is displayed on the display device in a time-sharing manner. Thereby, if the input person who entered the character string in the input field of the input screen indicates the display of the already input character string, the dummy character string will be displayed on the display device. It is possible to display the dummy character string on the display device before confirming it, check the contents of the already entered character string, and if the input error is recognized, it is possible to perform an operation such as confirming after correcting the already entered character string It becomes. Therefore, according to the first aspect of the present invention, it is possible to prevent the processing from being locked due to an input error of the character string.
According to the first aspect of the present invention , since it is not necessary for the input person to specify the position of the character to be confirmed among the already inputted character strings, it is more easily confirmed whether or not an input error has occurred in the already inputted character string. can do. In addition, since all of the input character strings are displayed by displaying the already input character strings in a time-sharing manner part by part, the existing input character strings are not leaked to a third party. It is possible to reliably check whether an input error has occurred in the input character string. In the first aspect of the present invention, the predetermined number of characters may be selected in order from the beginning or end of the already input character string, for example, as described in claim 2 , or from the already input character string. You may make it select at random.

According to a third aspect of the present invention, there is provided a program comprising a display device and an input device, wherein an input screen on which the character string input in the input field is converted into another character string and displayed in the input field is displayed on the display device. In the displayed state, the input device is operated to input a character string to the input field, or a server computer connected to the terminal device via a communication line, When display of an already input character string that has already been input to the input field is instructed, a predetermined number of characters are selected from the already input character string, and characters other than the selected character in the already input character string By generating a dummy character string in which the character is converted to a fixed character and displaying the generated dummy character string on the display device while sequentially selecting undisplayed characters as the dummy character string. Input string It is characterized by causing parts to function as a character string confirmation auxiliary means to be displayed on the display device in time division in one portion.
A program according to a third aspect of the present invention includes a display device and an input device, and a character string input in the input field is converted to another character string and displayed on the display device. A terminal device in which a character string is input to the input field by operating the input device, or a server computer connected to the terminal device via a communication line is used as the character string confirmation assisting means. Since the program is a functioning program, the terminal device or the server computer executes the program according to the invention according to claim 3, so that the terminal device or the server computer has the character string input support device according to claim 1. As in the first aspect of the invention, it is possible to prevent the processing from being locked due to an input error of the character string.

The present invention described above, when the display of the already input character string which has already been input to the input section is instructed to select the predetermined number of characters from the already input character string, the already input character string A dummy character string is generated by converting characters other than the selected character into a certain character, and the generated dummy character string is displayed on the display device while sequentially selecting characters that have not been displayed as dummy character strings. By repeating, since all of the already input character string is displayed on the display device in a time-sharing manner partly, it is possible to prevent the processing from being locked due to an input error of the character string. Has an excellent effect.

Hereinafter, with reference to the accompanying drawings, it will be described first comparative example of the present invention in detail. FIG. 1 shows a computer system 10 according to this comparative example . The computer system 10 includes a server computer 14 connected to a network 12. As the network 12, for example, a computer network such as the Internet can be applied.

The server computer 14 includes a control unit 16 including a CPU, a ROM, and a RAM. The control unit 16 includes a storage unit 18 including a storage medium such as an HDD (Hard Disk Drive), a CRT, or an LCD. Are connected to each other, a display unit 20 composed of, etc., an operation input unit 22 composed of a keyboard, a mouse and the like, and a communication control unit 24. In this comparative example , the server computer 14 accepts an online financial transaction execution instruction from a predetermined website (for example, a customer, and implements online financial transaction by transferring the received execution instruction to a financial institution. Functioning as a web server for operating a website for online financial transactions, etc., and information on each web page constituting the predetermined website is stored in the storage unit 18, and a web for operating the predetermined website is stored. A site management program is also installed.

  In addition, a terminal device 28 owned by the customer is connected to the network 12. The terminal device 28 includes a PDA and a PC, and includes a control unit 30 configured to include a CPU, a ROM, and a RAM. The control unit 30 includes a storage unit 32, a display unit 34, an operation input unit 36, and a communication control unit 38. Each is configured to be connected. When the terminal device 28 is a PDA, for example, a nonvolatile memory is used as the storage unit 32, an LCD is used as the display unit 34, a touch panel is used as the operation input unit 36, and the terminal device 28 is a PC. For example, an HDD is used as the storage unit 32, an LCD or CRT is used as the display unit 34, and a keyboard or mouse is used as the operation input unit 36.

  The customer also has a portable terminal 42 (for example, a portable telephone having a function of performing communication via the network 12). The portable terminal 42 includes a control unit 44 configured to include a CPU, ROM, and RAM. The control unit 44 includes a storage unit 46 including a nonvolatile memory, a display unit 48 including an LCD, and an operation input unit including a numeric keypad. 50 and the communication control unit 52 are connected to each other. The network 12 is connected to a wireless network in which a large number of base stations 40 are connected to each other (FIG. 1 schematically shows only a single base station 40). By performing wireless communication with (the nearest base station 40), communication with any computer (for example, server computer 14) connected to the network 12 is enabled.

Next, the operation of this comparative example will be described. The predetermined website according to this comparative example is a website that provides a predetermined service only to a user who has signed a use contract in advance, and each user who has signed a use contract has a contractor number and a password. Each number is given. Each user's contractor number and personal identification number are stored in the storage unit 18 of the server computer 14 as a user database (DB). When a predetermined website is accessed by a customer via the portable terminal 42 or the terminal device 28, the server computer 14 is shown in FIG. 3A as an example in order to identify the customer who has accessed the predetermined website. Contractor number input screen data representing a contractor number input screen (web page) as shown is read from the storage unit 18 and transmitted to the access source mobile terminal 42 or terminal device 28 via the network 12.

  When this contractor number input screen data is received by the mobile terminal 42 or the terminal device 28 as the access source, an input field 60A for inputting the contractor number is provided as shown in FIG. 3A as an example. A button for instructing transmission of the contractor number input in the input field 60A (button indicated as “execution”) 60B, and a button for clearing the number input in the input field 60A (notation “clear”) The contractor number input screen provided with the button 60 </ b> C is displayed on the display unit 48 of the portable terminal 42 or the display unit 34 of the terminal device 28. When the customer who confirms the displayed contractor number input screen operates the operation input unit 50 of the portable terminal 42 or the operation input unit 36 of the terminal device 28 and inputs a predetermined contractor number, FIG. ), The entered contractor number is displayed as it is in the input field 60A. For this reason, the customer confirms the contractor number displayed in the input field 60A, and if there is an input error or the like, clears the entered contractor number by selecting the button 60C, and then inputs the contractor number again. .

When it is confirmed that the entered contractor number is correct, the customer selects the button 60B. As a result, the contractor number input by the customer is transmitted to the server computer 14 from the mobile terminal 42 or the terminal device 28 that is the access source. When the contractor number is received from the mobile terminal 42 or the terminal device 28 as the access source, the server computer 14 uses FIG. 3 as an example in order to confirm that the customer who has accessed the predetermined website is an authorized user. The personal identification number input screen data representing the personal identification number input screen (web page) as shown in (C) is read from the storage unit 18 and transmitted to the mobile terminal 42 or the terminal device 28 that is the access source via the network 12. A program (for example, a password input program composed of a script or the like) for causing the access source mobile terminal 42 or the terminal device 28 to perform a password input process described below is added to the password input screen data. After the personal identification number input screen data and the personal identification number input program are received by the mobile terminal 42 or the terminal device 28 of the access source, the personal identification number input program is the control unit (if the portable terminal 42 is the control unit 44, the terminal device 28 For example, the password input process is performed by the control unit 30) . Below, this personal identification number input processing will be described with reference to the flowchart of FIG.

In step 100, a personal identification number input screen is displayed on the display unit (display unit 48 if the device executing the personal identification number input process is the portable terminal 42, and display unit 34 if the device is the terminal device 28). As shown in FIG. 3C, on the password input screen according to this comparative example , an input field 62A for inputting a password and a button for instructing transmission of the password entered in the input field 62A ( A button (labeled “execute”) 62B, a button (button labeled “clear”) 62C for clearing the number (character string) entered in the input field 62A, and a number (character string) entered in the input field 62A ) Button (button labeled “Confirm”) 62D is provided.

  In the next step 102, the operation input unit (the operation input unit 50 if the device executing the password input process is the portable terminal 42, the operation input unit 36 if the device is the terminal device 28) is operated to operate the character. It is determined whether or not is input. If the determination in step 102 is negative, the process proceeds to step 106, and it is determined whether or not clearing of the input character has been instructed. If this determination is also negative, the routine proceeds to step 110, where it is determined whether transmission of the input character string has been instructed. If this determination is also negative, the routine proceeds to step 112, where it is determined whether confirmation of the input character string has been instructed. If this determination is also negative, the process returns to step 102, and steps 102, 106, 110, and 112 are repeated until the determination of any of steps 102, 106, 110, and 112 is affirmed.

  When a character corresponding to the password is input by operating the operation input unit by the customer, the determination in step 102 is affirmed and the process proceeds to step 104, and the input character is stored in the storage unit (password input process). If the executing device is the portable terminal 42, the storage unit 46 stores the terminal device 28, and the storage unit 32) stores the specific character (for example, “*” etc.) in the input field in the password input screen. After displaying on 62A, the routine proceeds to step 106. Since the determination in step 102 is affirmed every time a character corresponding to the password is input, the characters sequentially input by the customer operating the operation input unit are sequentially stored in the storage unit as a character string corresponding to the password. As well as being stored, as shown in FIG. 3D, the input field 62A displays the same number of specific characters as the number of input characters.

  If the customer selects the button 62C to instruct clearing of the input characters, the determination in step 106 is affirmed and the process proceeds to step 108, where it is stored in the storage unit as a password. The process proceeds to step 110 after clearing all the character strings and deleting all the specific characters displayed in the input field 62A. Instead of clearing all stored character strings, each time the button 62C is selected by the customer, the characters may be cleared one by one from the end of the stored character string.

By the way, although the predetermined website according to this comparative example can use English characters in addition to numbers as the password, the input operation of English characters is particularly complicated on the mobile terminal 42 and the like, and an input error is caused. It is likely to occur. On the other hand, since the character string input by the customer operating the operation input unit is converted into a specific character and displayed in the input field 62A, the number of input characters can be recognized even by referring to the display of the input field 62A. , The entered character string itself cannot be confirmed.

  For this reason, when it is desired to confirm whether or not there is an input error in the character string input as the password, the customer confirms the input character string by performing an operation of selecting the button 62D in the password input screen. Instruct the execution of processing for. When the operation of selecting the button 62D is performed, the determination in step 112 is affirmed and the process proceeds to step 114, and a confirmation number having the same number of characters in the input character string is generated by a random number or the like (however, For example, as shown in FIG. 3E, the generated confirmation number is displayed on the display unit. Further, the confirmation number display screen is provided with an input field 62E for the customer to input numbers. In the next step 116, any of the numbers included in the displayed confirmation number is input field 62E. And step 116 is repeated until the determination is affirmative.

  When the confirmation number is displayed on the display, the customer determines the number of the character to be confirmed from the beginning of the character string entered as the password, and specifies the position of the character to be confirmed. The characters located at the same position on the displayed confirmation number are input via the operation input unit. For example, if the personal identification number is the character string “xabc1234” and the character to be confirmed is the second character “a” from the beginning of this personal identification number, the customer will be the second of the displayed confirmation numbers. Enter a number (for example, if the displayed confirmation number is “93652147”, the second number “3” from the top). Note that the numbers input by the customer are displayed in the input field 62E after being replaced with specific characters (for example, “*”, etc.) as shown in FIG.

When a number is input by the customer, the determination in step 116 is affirmed and the process proceeds to step 118. Based on the number input by the customer, the character to be confirmed is determined from the beginning of the character string input as the password. Recognize the second character. Then, a dummy character string is generated in which a character to be confirmed exists at the same position as the character string input as the password, and the remaining characters are determined by random numbers. In the next step 120, the generated dummy character string is displayed on the display unit. Thus, Ru can see whether there is an input error in the check target character.

  For example, if the PIN is the string “xabc1234”, the confirmation number is “93652147”, and the number entered by the customer is the second number “3” from the beginning of the confirmation number, the confirmation target character is the PIN Can be determined as the second character “a” from the beginning of the character string input as, as shown in FIG. 3G, for example, the character “a” exists second from the beginning, and the remaining characters A dummy character string “bacefxyz” in which characters are determined by random numbers is displayed. Then, by referring to the displayed dummy character string, the customer can confirm that the second character from the top of the character string previously input as the personal identification number is “a”.

  Note that the number of digits that can be entered by the customer is not limited to one, and if there are a plurality of characters to be confirmed, a plurality of digits corresponding to each character to be confirmed may be input. . For example, if the PIN is the character string “xabc1234”, the confirmation number is “93652147”, and the numbers entered by the customer are the second and eighth numbers “37” from the beginning of the confirmation number, the characters to be confirmed Can be determined to be the second character “a” and the eighth character “4” from the beginning of the character string input as the personal identification number, and therefore the character “a” is present second from the beginning, and 8 from the beginning. The character “4” exists in the second place, and a dummy character string “bacefxy4” in which the remaining characters are determined by random numbers is displayed. Then, by referring to the displayed dummy character string, the customer has “a” as the second character from the top of the character string previously input as the personal identification number, and “4” as the eighth character from the top. Can be confirmed at the same time.

  Further, the remaining characters in the dummy character string may be replaced with specific characters (eg, “*”) instead of being determined by random numbers. In the above example, the dummy character string “* a ******” is replaced with the dummy character string “bacefxyz”, the dummy character string “* a ****” is replaced with the dummy character string “bacefxy4”. * 4 "may be displayed. In addition, as described above, instead of inputting the character to be confirmed on the personal identification number and the number located at the same position on the confirmation number, the position of the character to be confirmed on the personal identification number (Number of characters from the beginning or end) may be entered (for example, instead of entering the second number “3” from the beginning of the confirmation number “93652147”, it should be the second from the beginning. Enter “2” for

  On the dummy character string display screen, in addition to the button 62C for clearing the input character string, a button for instructing the return to the state in which the personal identification number input screen is displayed (represented as “return”). Button F) is provided, and in the next step 122, it is determined whether or not an instruction to return to the state in which the personal identification number input screen is displayed is given. If the determination is negative, the routine proceeds to step 124, where it is determined whether or not an instruction for clearing the character string has been issued. If this determination is also negative, the routine returns to step 122, and steps 122 and 124 are repeated until either determination is affirmed.

  As a result of referring to the dummy character string displayed on the display unit, when it is confirmed that there is no input error in the character to be confirmed, the customer selects the button 62F to display the password input screen. Instruct to return. As a result, the determination in step 122 is affirmed, and the process proceeds to step 126, where the display unit again displays the password number input screen, and characters already input as password numbers in the input field 62A of the password number input screen. After displaying the same number of specific characters (for example, “*”) as the number of characters in the column (see FIG. 3D or H), the process returns to step 102. In this case, by performing the operation of selecting the button 62D again, other characters of the character string input as the personal identification number are displayed as a part of the dummy character string, and whether or not there has been an input error in the other characters is renewed. It is also possible to confirm.

  On the other hand, as a result of referring to the dummy character string displayed on the display unit, when recognizing that there is an input error in the character to be confirmed, the customer inputs the password by performing an operation of selecting the button 62C. Instructs clearing of the character string. In this case, the determination in step 124 is affirmed and the routine proceeds to step 128, where all the character strings stored in the storage unit as passwords are cleared and all the specific characters displayed in the input field 62A are deleted. After the personal identification number input screen is displayed again on the display unit (see FIG. 3C), the process returns to step 102. In this case, it is necessary to input the character string as the personal identification number again, but it is possible to prevent the personal identification number in which an input error has occurred from being transmitted to the server computer 14.

  When the customer confirms that the input character string has not been input error by checking the input character string as necessary, the customer performs the operation of selecting the button 62B to change the password. Instruct to send. As a result, the determination in step 110 is affirmed and the routine proceeds to step 130, where the character string stored in the storage unit as the password is transmitted to the server computer 14 as the password, and the password input process is terminated.

  When the server computer 14 receives a password (character string) from the mobile terminal 42 or terminal device 28 that is the access source, the server computer 14 uses the contractor number already received from the same mobile terminal 42 or terminal device 28 as a key. The user DB is searched, and the personal identification number stored in the user DB is extracted in association with the contractor number. Then, it is determined whether or not the customer who accesses the predetermined website is a legitimate user by determining whether or not the extracted password is coincident with the received password.

When the personal identification number received from the access source portable terminal 42 or the terminal device 28 does not match the personal identification number stored in the user DB, the server computer 14 The error information is transmitted to the device 28, and the above-described password number input process is repeated, so that the password number is input a plurality of times, and a password number different from the password number stored in the user DB is predetermined. If it is received consecutively, it will process to lock the use of the predetermined website by the customer. As mentioned above, the password input process according to this comparative example confirms the character string entered as the password. It is possible to prevent a situation where an authorized user of a predetermined website cannot use the predetermined website due to an incorrect input of a password. Door can be.

  In addition, when setting a password that may be input via a PDA that is a kind of mobile terminal 42 or terminal device 28 with a limited number of keys for input, processing is locked due to an input error, etc. It is not necessary to consider the possibility of inconvenience, and a personal identification number can be used as it is based on the assumption that various characters can be input via a PC that is relatively easy to input. Therefore, user convenience can be improved.

In the above, the customer specifies the position of the character to be confirmed in the character string input as the password, and the character to be confirmed is the same position as the character to be confirmed on the character string input as the password. Although the example of displaying the dummy character string existing in the display part has been described, the present invention is not limited to this, and when the display of the character string input as the password is instructed, the password is input as the password. Among the received character strings, dummy characters obtained by converting characters that are relatively easy to input on the mobile terminal 42 or the terminal device 28 of the access source (that is, characters that are unlikely to cause an input error) into specific characters (for example, “*”). A column may be generated and displayed on the display unit. As an example, since the mobile terminal 42 is generally provided with a numeric keypad as the operation input unit 50, the access source is the mobile terminal 42, and the character string “xabc1234” is input as a personal identification number. Alternatively, a dummy character string “xabc ****” obtained by converting only a number in the character string into a specific character may be generated and displayed. In this embodiment, since the position of the check target character customer (inputter) it is not necessary for specifying the operation is easily ing.

Next, regarding the embodiment of the present invention, only the parts different from the comparative example described above will be described. In the present embodiment, when the display of the character string input as the personal identification number is instructed, a predetermined number of characters are selected from the character string input as the personal identification number, and the characters other than the selected character among the character strings are selected. A dummy character string converted from a character to a specific character (for example, “*”) is generated and displayed on the display unit, and automatically repeated while sequentially selecting undisplayed characters as a dummy character string in, and so as to be displayed in time division in portions all of the character string input as personal identification number. Specifically, when the character string “xabc1234” is input as the password, each time the confirmation button 62D is selected, for example, the dummy character strings “* a ** 1 ***”, “x ** c **” ** "" ** b *** 3 * "," Ru to display ***** 2 * 4 "to the order. Although the above is an example of displaying two characters at a time, the number of characters displayed at one time may be one character or three or more characters. The above is an example of randomly determining the character string to be displayed. For example, dummy character strings “xa *****”, “** bc ****”, “**** 12 **”, “ A predetermined number of characters may be displayed in order from the beginning (or the end) of the character string, for example, ****** 34 ". In this embodiment, it is not necessary for the customer (input person) to specify the position of the character to be confirmed, and the entire character string is displayed by displaying the character string input as a personal identification number part by time. Therefore, it is possible to reliably confirm whether or not an input error has occurred in the character string input as the password. This embodiment corresponds to the invention described in claim 1 (specifically, claim 2 ). In the above embodiment, the personal identification number input program corresponds to the program according to the present invention, and the portable terminal 42 or the terminal device 28 executes the personal identification number input program as the character string input support device according to the present invention. Function.

  Further, in the above, the password input program is transmitted from the server computer 14 to the portable terminal 42 or the terminal device 28, and the password input program is executed by the control unit of the portable terminal 42 or the terminal device 28. Although the aspect which makes the terminal device (the portable terminal 42 or the terminal device 28) function as the character string input support device according to the present invention has been described, the present invention is not limited to this, and the input field of the personal identification number input screen Each time a character is input to 62, the input character is converted into a specific character and displayed, and when the display of the character string input as a password is instructed, a dummy character string or the like is displayed. By executing a program for performing the above operation on a server computer connected to the terminal device according to the present invention via a communication line, the server computer It is possible to function as a character string input assist device of the invention.

  Moreover, although the example which applied this invention to the input of the PIN code for utilizing a predetermined website was demonstrated above, it is not limited to this. At present, there are very many opportunities to enter a PIN number or important information similar to it (for example, to enter a PIN number when performing a financial transaction via ATM (Automatic Teller Machine) or to use a specific function of a mobile terminal). It goes without saying that the present invention is applicable when inputting arbitrary important information.

Is a block diagram showing a schematic configuration of a computer system according to this comparative example. It is a flowchart which shows an example of the content of the PIN code input process performed with a portable terminal. It is an image figure which shows an example of the screen displayed on the display part of a portable terminal by the PIN code input process of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Computer system 12 Network 14 Server computer 28 Terminal device 30 Control part 34 Display part 36 Operation input part 42 Portable terminal 44 Control part 48 Display part 50 Operation input part

Claims (3)

The input device of the terminal device is operated in a state in which the character string input in the input field is converted into another character string and the input screen displayed in the input field is displayed on the display device of the terminal device. A character string input support device for supporting the input of a character string into the input field performed in
When display of an already input character string that has already been input to the input field is instructed, a predetermined number of characters are selected from the already input character string, and other than the selected character in the already input character string By generating a dummy character string obtained by converting a character into a certain character, and displaying the generated dummy character string on the display device, by repeating while sequentially selecting undisplayed characters as a dummy character string, A character string input assisting device comprising character string confirmation assisting means for displaying on the display device all of the already input character strings part by time in a time division manner . The character string confirmation assisting unit selects the predetermined number of characters in order from the beginning or the end of the input character string, or randomly selects the predetermined number of characters from the input character string. Item 1. A character string input support device according to Item 1 . A display device and an input device are provided, the character string input in the input field is converted into another character string, and the input device is operated while the input screen displayed in the input field is displayed on the display device. A terminal device in which a character string is input to the input field, or a server computer connected to the terminal device via a communication line,
When display of an already input character string that has already been input to the input field is instructed, a predetermined number of characters are selected from the already input character string, and other than the selected character in the already input character string By generating a dummy character string obtained by converting a character into a certain character, and displaying the generated dummy character string on the display device, by repeating while sequentially selecting undisplayed characters as a dummy character string, A program that functions as a character string confirmation assisting unit that causes the display device to display all of the already input character strings one by one in a time-sharing manner.

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