JP2002215305A - Input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an input device for password number capable of preventing leakage of a card holder's password number. SOLUTION: This password number input device 3 electrically connected to a settlement terminal 1 via a cable 2 is used by selecting and inputting selective elemental characters 11 composed of alphabets and numbers, and has a selective character display part 12 for displaying the selective elemental characters 11, an inputted character display part 13 for displaying the selected and inputted selective element characters 11 by four figures, a selection button (first key) 14 for selecting the display of the selective elemental characters 11 displayed on the selective character display part 12, an input button (second key) for determining and inputting the selected selective elemental characters 11, and deletion button 16 for deleting the selective elemental characters once inputted, and then determined from the inputted character display part 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input device for inputting alphanumeric characters such as a password.

[0002]

2. Description of the Related Art Currently, as an input device for inputting alphanumeric characters such as a personal identification number, a personal identification number input device used in a card processing system using a so-called David card, or a bank / post office deposit / deposit account. Automatic cash saving / payment machine (ATM: Automated)
There is a password input device in a payment terminal that is an attached Taller Machine.

Hereinafter, a password input device and a password input device of an ATM in a card processing system using a David card will be described with reference to the drawings.

First, a card processing system using a David card refers to a card processing system using a magnetic card (cash card) or the like issued by a bank as a debit card in a store or the like where goods are sold. This card processing system reads the attributes of a magnetic card into a payment terminal located at a store or the like without paying for cash when purchasing a product, and if the password is matched by collation of the PIN, it immediately This is to settle payment of money from a deposit account.

A conventional card processing system will be described with reference to FIG. FIG. 8A is a schematic diagram showing a conventional card processing system, and FIG. 8B is an enlarged view of a personal identification number input device in the card processing system.

As shown in FIG. 8A, a conventional card processing system comprises a payment terminal 100 and a password input device 1 electrically connected to the payment terminal 100 by a cable 101.
02 and a higher-level device 104 arranged in a bank or the like connected to the settlement terminal 100 by a cable 103 using a network line or the like.

The settlement terminal 100 has a magnetic reading unit 106 for reading an attribute of a magnetic card 105 indicating information of a cardholder's deposit account and the like, and an input unit 107 for inputting settlement data such as the price of a product. I have.

[0008] As shown in FIG. 8 (b), the password input device 102 is provided with a keyboard section 108 for inputting a password and the like, and a shielding plate 109.
The shield plate 109 is provided on the periphery of the password input device 102 so that when entering alphanumeric characters or the like of the password into the password input device 102, the number to be input to another person cannot be seen. .

The host device 104 is arranged at a bank or the like that has issued the magnetic card 105, and stores card attributes and a normal password related to the magnetic card 105.

Next, a method of collating a personal identification number by inputting a personal identification number through the personal identification number input device 102 will be described.

[0011] A store operator inputs payment data, such as the price of a product, from the input unit 107 of the payment terminal 100 to the payment terminal 100, and sets the attributes of the card of the magnetic card 105 possessed by the card holder in order to settle the payment. Is read by the magnetic reading unit 106.

[0012] Thereafter, the card holder operates the magnetic card 105 by using the keyboard unit 108 of the personal identification number input device 102.
Enter a password consisting of alphanumeric characters. The input password data is transmitted via the cable 101 to the payment terminal 1
00, and the personal identification number data is transmitted to the host device 104 via the transmission cable 103.

[0013] Then, the personal identification number stored in advance in the higher-level device 104 is collated with the personal identification number transmitted from the settlement terminal 100 to the higher-level device 104, and if they match, the payment processing with the magnetic card 109 is enabled. In the case of mismatch, the settlement processing is impossible.

Next, a conventional ATM installed in a bank or the like will be described with reference to FIG. FIG. 9 (a)
FIG. 9 is an external perspective view of a conventional ATM, and FIG.
FIG. 4 is an enlarged view of a display screen for inputting an ATM password.

[0015] As shown in FIG.
Reference numeral 00 denotes a magnetic reading unit 202 that reads attributes of a magnetic card 201 such as a cash card, a display screen 203, and a touch panel 20 provided on the display screen 203.
And 4.

Next, a case will be described in which a personal identification number is input and a deposit / saving is withdrawn from a cardholder's account using a conventional ATM.

First, the user operates the touch panel 204 to select a withdrawal item for dispensing money from the application items displayed on the initial screen (not shown) of the display screen 203. Following the instructions, Figure 9
As shown in (a), the card holder is a magnetic card 201
Into the magnetic reading unit 202.

Next, as shown in FIG. 9 (b), a message "Please enter your password" is displayed on the display screen 203, and alphanumeric characters from 0 to 9 as selection element characters are displayed. Is done. Touch keys 205 are arranged at positions corresponding to alphanumeric characters.

Thereafter, in accordance with the instruction on the display screen 203, the user operates the touch key 205 to input a 4-digit alphanumeric password. As a result, the identity is confirmed, and if the password is correctly collated, the withdrawal processing at the ATM 200 can proceed, and the designated money is withdrawn from the cardholder's account. On the other hand, if the password is not correctly collated, the dispensing process cannot proceed, and an instruction to input the password again is issued.

[0020]

However, in the above-mentioned card processing system, when the card holder operates the keys of the keyboard unit 108 of the personal identification number input device 102 to input the personal identification number, the input personal identification number does not correspond to another person. There is a problem that the password is leaked because the password is seen from behind or the password is guessed according to the operation sequence of the key operation.

Although the shielding plate 109 alleviates this problem, it is possible for others to see the personal identification number and key operation, and the secretary number input device 102 can be seen by the payment terminal 100 so as not to be seen. Payment terminal 100 and PIN input device 102
There is a limit because it is connected by 1.

Similarly, in the ATM 200, when the card holder operates the touch key 205 to input the password, the input password can be seen from behind by another person, or the password can be viewed by the operation sequence of the touch key 205. There has been a problem that the password is leaked due to the guess of the number.

As a result, another person who has stolen or forged the card can purchase the commodity using the personal identification number obtained with the card. Therefore, there is a problem that a legitimate cardholder suffers a great deal of damage such as payment of money even for a product that has not been purchased.

The present invention has been made to solve the above problems, and has as its object to provide a password input device that does not leak the password of a card holder.

[0025]

A first input device according to the present invention comprises a display screen for displaying a selected element character, a first key for selecting the selected element character, and a selected key. And a second key for inputting an element character.

According to the first input device of the present invention, the selected element character displayed on the display screen of the input device can be selected by the first key, and the selected element character can be determined by the second key. In addition, the leakage of the personal identification number due to the assumption of the personal identification number based on the operation sequence of the key operation by the card holder is reduced.

Further, a second input device according to the present invention includes a display screen for displaying a first selected element character and a second selected element character to be selected, and a second screen for selecting the first selected element character. 1 key, a second key for inputting the selected first selected element character, a third key for selecting the second selected element character, and inputting the selected second selected element character And a fourth key for inputting a password.

According to the second input device of the present invention, 2
Since it becomes possible to input by combining two selection element characters,
The degree of freedom in selecting the selected element character is further increased, and the leakage of the personal identification number due to the assumption of the personal identification number by the operation sequence of the key operation of the card holder is drastically reduced.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an input device according to an embodiment of the present invention will be described with reference to the drawings.

First Embodiment Hereinafter, an input device according to a first embodiment will be described with reference to FIGS.

FIG. 1A is a schematic diagram of a card processing system according to the first embodiment, and FIG. 1B is an enlarged view of an input device for inputting a personal identification number according to the first embodiment. It is.

As shown in FIG. 1A, the card processing system according to the first embodiment comprises a payment terminal 1 and a personal identification number input device 3 electrically connected to the payment terminal 1 via a cable 2. And payment terminal 1 using a network line or the like
And a higher-level device (not shown) connected by a cable 4.

The payment terminal 1 includes a magnetic reading unit 5 and an input unit 6
, A first display unit 7, a second display unit 8, and a printer 9 for outputting a receipt indicating purchase details.

The magnetic reading unit 5 reads a card attribute indicating information of a card holder by passing a magnetic card 10 such as a bank cash card through a groove.
When an IC card is used instead of the magnetic card 10, a reading unit that can read the attributes of the IC card may be used.

The input unit 6 is a numeric keypad such as a numeral, and is used for inputting information such as price information of a product price. The input unit 6 may be a membrane switch or a touch panel. Alternatively, if information such as the price of a product can be read by a barcode, it is possible to replace the barcode reading means without providing the input unit 6.

The first display section 7 calculates the monetary information such as the commodity price inputted by the input section 6 and displays the settlement data which is the total payment amount. The second display section 8 displays
The payment data is displayed to the purchaser.

Next, as shown in FIG. 1 (b), the personal identification number input device 3 according to the first embodiment has a selection element character (displayed as "9" in the figure) 11 consisting of alphanumeric characters. A selected character display unit 12 for displaying the selected element character 11, an input character display unit 13 for displaying the selected and selected and input selected element character 11 in four digits, and a selected character display. A selection button (first key) 14 for selecting display of the selected element character 11 displayed on the section 12 and an input button (second key) for determining and inputting the selected selected element character 11
Key) 15 and selected element character 1 entered and determined once
And a cancel button 16 for deleting 1 from the input character display section 13. Note that the select button 14, the input button 15, and the cancel button 16 are arranged horizontally in this order.

Next, a method of inputting a personal identification number to the personal identification number input device 3 and collating the personal identification number will be described with reference to FIG.

First, an operator of a store or the like determines the price of a product purchased by a product purchaser, etc., in a settlement terminal 1 (commonly known as a cash register).
Is input and totaled by the input unit 6. At this time, although not shown, a bar code reader is often used together.

The purchaser deposits a magnetic card 10 that can be used as a debit card for the settlement of the price with the operator, and the operator reads the attribute data of the magnetic card 10 through the magnetic reading unit 5 of the settlement terminal 1.

After that, the merchandise purchaser who is the card holder inputs the personal identification number using the personal identification number input device 3. The input four-digit password is transmitted to the host device, the password is collated, and the identity of the user is confirmed. If the password is correctly collated, the payment process at the payment terminal 1 proceeds, and the purchase amount is deducted from the cardholder's account. If the password is not correctly verified, the settlement process cannot be performed.

Next, the case of inputting a personal identification number to the personal identification number input device 3 will be described in more detail with reference to FIG. For example, a case where a product purchaser inputs a four-digit personal identification number “8278” will be described.

First, the selection element character 11 displayed on the selection character display section 12 of the personal identification number input device 3 is selected by a selection button 14.
By pressing, the selected element character 11 becomes, for example,
From "9" to "8", "7", "6", "5", "4",
"3", "2", "1", "0" are sequentially changed.
Here, if the purchaser needs “8” as the first digit of the personal identification number, when “8” is displayed on the selected character display unit 12, the input button 15 is pressed to set “8”. Is input to the input character display section 13 and the input of the first digit is completed. The selection element character 11 may be changed once each time the selection button 14 is pressed, or may be scrolled by keeping the selection button 14 pressed.

When the input of the first digit is completed, an asterisk mark (“*”) 17 is displayed on the input character display unit 13 to inform the input person that the first digit has been input. Is displayed.

Next, similarly to the input of the first digit, the alphanumeric character of the second digit password is input. That is, the selection element character 11 is set to “2” to be input by the selection button 14, and the input of the second digit is completed by the input button 15.

Similarly, the alphanumeric characters "7" and "8" of the password to be entered in the third and fourth digits are sequentially inputted.
It is possible to input a 4-digit password “8278”.

When the selected element character 11 which is not scheduled to be input is displayed, the input button 15 is pressed by mistake,
When the selected element character 11 that is not scheduled to be input is input, the selected element character 11 input by the cancel button 16 is deleted. After the deletion, "8" can be selected again as the selected element character 11 by the selection button 14 and re-input by the input button 15.

In the first embodiment, the order in which the alphanumeric characters of the selected element character 11 are displayed is the descending order of the alphanumeric characters. However, the display control unit in the personal identification number input device 3 is provided with a random number generation function. By changing the display order of alphanumeric characters, for example,
"2", "5", "3", "9", "0", "7",
It is also possible to randomly display such as “8”, “5”, “1”, “6”, “4”. By displaying the alphanumeric characters randomly, the password is less likely to be guessed by the key operation, compared to displaying the alphanumeric characters in descending or ascending order.

Next, a first modification of the personal identification number input device 3 according to the first embodiment will be described with reference to FIG. FIG. 2 is an enlarged plan view of a personal identification number input device 3a according to a first modification of the first embodiment.

As shown in FIG. 2, the password input device 3a
Is an alphabetic character as the selected element character 11 in the selected character display section 12 (in FIG. 2, it is displayed as "A").
Is displayed.

Thus, the personal identification number can be changed to 26 characters (A to A).
Z), for example, "ABC
D "or four digits of alphanumeric and alphabetic characters, for example," A1B1 ".

The method of inputting the personal identification number to the personal identification number input device 3a is basically the same as that of the personal identification number input device 3 according to the first embodiment, and the description thereof will be omitted. The selected element character 11 displayed on the selected character display section 12
For example, alphanumeric characters and alphabetic characters can be arranged in ascending order (0 to 9) and then alphabetical characters can be arranged in alphabetical order (A to Z). Well, there are countless combinations.

Next, a second modification of the personal identification number input device 3 according to the first embodiment will be described with reference to FIG. FIG. 3 is an enlarged plan view of a personal identification number input device 3b according to a second modification of the first embodiment.

As shown in FIG. 3, the password input device 3b
Is a liquid crystal display screen 18 as a display screen, a touch panel 19 is overlaid on the liquid crystal display screen 18,
4. The input button 15 and the cancel button 16 are displayed on the touch panel 19. Note that the select button 14, the input button 15, and the cancel button 16 are not push button type but touch keys. Thereby, the password input device can be made thinner.

In the input device for inputting a personal identification number according to the first embodiment, the character size of the selected element character 11 is set within a legible range so that the input personal identification number is not directly seen from behind. It is desirable to make it as small as possible. This is the same for the following embodiments.

(Second Embodiment) Hereinafter, an input device according to a second embodiment will be described with reference to FIGS.

FIG. 4A is a schematic diagram of a payment terminal according to the second embodiment, and FIG. 4B is an enlarged plan view of a personal identification number input device in the payment terminal according to the second embodiment. It is.

[0058] As shown in FIG.
The payment terminal 20 of a payment machine (ATM) withdraws and deposits deposits and savings (deposits, etc.) from a bank or a post office (banks, etc.) from an account without human intervention, and deposits money into the account. ,
Or you can transfer money to someone else's account.

The settlement terminal 20 includes a magnetic reading unit 22 for reading the attributes of a magnetic card 21 such as a cash card, a password input device 23 for inputting a password, a cash outlet 24 for receiving and transferring cash, a deposit and the like. And a printer 25 that prints and outputs a statement indicating the balance of. When an IC card is used instead of the magnetic card 21, I
What is necessary is just to make the reading means which can read the attribute of C card.

The personal identification number input device 23 has a display screen 26
A selection button (first key) 27 for selecting the display of the selected element character 11, an input button (second key) 28 for determining and inputting the displayed selected element character 11, and the determined selected element character 11 It has a cancel button 29 for canceling. The selection button 27, the input button 28, and the cancel button 2
Reference numerals 9 are sequentially arranged in a horizontal row below the display screen 26.

Next, as shown in FIG. 4 (b), the display screen 26 displays a selected character display section 30 for displaying the selected element character 11 to be selected, and a selected and determined input character 11 for the selected element. And an input character display unit 31 for displaying four digits. The display screen 26 displays a message prompting the user of the payment terminal 20 to issue various other input instructions.

Next, a case in which a deposit number is withdrawn from the settlement terminal 20 by inputting a personal identification number will be described with reference to FIG.

First, as shown in FIG. 4A, the user selects a withdrawal item from the application items displayed on the initial screen (not shown) of the display screen 26 of the settlement terminal 20, and selects the withdrawal item. The magnetic card 21 is inserted into the reading unit 22.

Thereafter, as shown in FIG. 4B, a message "Please enter a password" is displayed on the display screen 26, and the selected character 1
1 (displayed as “9” in the figure) is displayed.

The user (card holder) inputs a 4-digit alphanumeric password into the password input device 23. Collation for identity verification is performed based on the input personal identification number.
When the password is correctly collated, the withdrawal processing at the settlement terminal 20 proceeds, and the statement is issued from the printer 25 at the same time as the designated withdrawal amount is withdrawn from the cardholder's account, and the cash withdrawal port 24 is used. Cash will be withdrawn from If the password is not correctly collated, this process is not performed, and an instruction to input the password is issued again.

Next, the case of inputting a personal identification number to the personal identification number input device 23 will be described in more detail with reference to FIG. For example, if the user of the payment terminal 20 determines “82
The case where a four-digit password of "78" is input will be described.

First, the display screen 2 of the personal identification number input device 23
6 selected element character 11 displayed on the selected character display section 30
By pressing the select button 28, the selected element character 11
Is, for example, from "9", "8", "7", "6",
It changes sequentially to "5", "4", "3", "2", "1", "0". Here, if the user needs “8” as the first digit of the personal identification number, when “8” is displayed on the selected character display unit 30, by pressing the input button 28, “8” is displayed. The input to the input display unit 31 and the input of the first digit is completed. The selection element character 11 may be changed once each time the selection button 27 is pressed, or may be scrolled by keeping the selection button 27 pressed.

When the input of the first digit is completed, an asterisk mark (“*”) 32 is displayed on the input character display unit 31 to notify the input person of the input of the first digit. Is displayed.

Next, similarly to the input of the first digit, the alphanumeric character of the second digit password is input. That is, the selection element character 11 is changed to “2” to be input by the selection button 27, and the input of the second digit is completed by the input button 28.

Similarly, the alphanumeric characters “7” and “8” of the password to be entered in the third and fourth digits are sequentially input, and
It is possible to input a 4-digit password “8278”.

When the selected element character 11 which is not scheduled to be input is displayed, the input button 28 is pressed by mistake,
When the selected element character 11 is input, the cancel button 2
9 deletes the selected element character 11 input from the input character display section 31. After that, “8” is selected again as the selected element character 11 by the selection button 27, and can be input again by the input button 28.

In the second embodiment, the alphanumeric characters of the selected element character 11 are displayed in descending order of the alphanumeric characters. However, as in the first embodiment, the password input device 23 is used.
By having a random number generation function in the display control unit in the
The display order of the alphanumeric characters is, for example, “2”, “5”, “3”,
"9", "0", "7", "8", "5", "1",
They can be displayed randomly such as "6" and "4". By displaying alphanumeric characters randomly,
As compared with displaying the alphanumeric characters in descending or ascending order, the password is less likely to be guessed by the key operation.

Next, a first modification of the personal identification number input device according to the second embodiment will be described with reference to FIG.
FIG. 5 is an enlarged plan view of a personal identification number input device 23a according to a first modification of the second embodiment.

As shown in FIG. 5, the password input device 23
a denotes a push button type selection button 27, an input button 28, and a cancel button 29 provided separately from the display screen 26.
Is used, the touch panel is overlaid on the display screen 26, and the select button 27, the input button 28, and the cancel button 29 are used as touch keys. Further, a selection character display section 30 for displaying the selection element character 11 is displayed by selecting a selection button 27 and an input button 28.
It is provided so as to be located between them.

As a result, the selected character display section 30 can be covered with the hand while operating the keys of the selection button 27 and the input button 28, so that the selected element character 11 to be input is hardly seen by others from behind. Become.

Next, a second modification of the personal identification number input device according to the second embodiment will be described with reference to FIG.
FIG. 6 is an enlarged plan view of a personal identification number input device 23b according to a second modification of the second embodiment.

As shown in FIG. 6, the password input device 23
b shows that the selected character display section 30 is further arranged at a corner of the display screen 26.

Thus, the selection element character 11 to be input is less likely to be seen by others from behind. The second
The same components as those of the personal identification number input device 23a of the first modification of the embodiment are denoted by the same reference numerals, and description thereof will be omitted here.

Next, a third modification of the personal identification number input device according to the second embodiment will be described with reference to FIG.
FIG. 7 is an enlarged plan view of a personal identification number input device 23c according to a third modification of the second embodiment.

As shown in FIG. 7, the password input device 23
c further includes two selection buttons 27a and 27b,
It is provided with two input buttons 28a and 28b and two selected character display sections 30a and 30b.

The selected character display section 30a displays alphabetic characters as selected element characters (first selected element characters) 11a, and the selected character display section 30b displays selected element characters (second selected element characters) 11b. Is displayed as alphanumeric characters. Alphabet characters are selected and input by a selection button (first key) 27a and an input button (second key) 28a, and alphanumeric characters are selected by a selection button (third key) 27b.
And an input button (fourth key) 28b.

Thus, even if the password is "A1B2" and the alphabet and the alphanumeric characters are mixed, the operation is not complicated since there are separate selection and input buttons.

In the second embodiment, the password input device 23 of the payment terminal 20 and the like are used as input devices, but the payment terminal 20 itself may be used as the input device.

[0084]

According to the input device of the present invention, there is provided a display screen for displaying a selected element character, a first key for selecting the selected element character, and a second key for inputting the selected selected element character. Key, the selection element character displayed on the display screen of the input device can be selected by the first key and the selection element character can be determined by the second key. According to the operation order, it is less likely that the password is guessed and the password is leaked.

Further, the input device of the present invention has a display screen for displaying a first selected element character and a second selected element character to be selected, and a first key for selecting the first selected element character. Inputting the selected first selected element character;
Key, a third key for selecting the second selected element character, and a fourth key for inputting the selected second selected element character
Key, the user can input two selected element characters in combination, so that the degree of freedom in selecting the selected element character is further increased, and the personal identification number is estimated by the card holder's key operation sequence. It is greatly reduced that the password is leaked.

Further, according to the input device of the present invention, the number of characters corresponding to the selected element character for inputting the personal identification number (10 characters for alphanumeric characters, 26 characters for alphabetic characters) as in the prior art ) Without displaying on the screen, a selection character display portion for displaying one or two selection element characters, a selection button for selecting the selection element characters, and an input button for inputting the selection element characters. An input device for inputting a password or the like can be reduced in size and weight.

[Brief description of the drawings]

FIG. 1A is a schematic diagram of a card processing system according to a first embodiment. FIG. 1B is an enlarged view of an input device for inputting a personal identification number according to the first embodiment.

FIG. 2 is an enlarged plan view of a personal identification number input device according to a first modification of the first embodiment.

FIG. 3 is an enlarged plan view of a password input device according to a second modification of the first embodiment;

FIG. 4A is a schematic diagram of a payment terminal according to a second embodiment. FIG. 4B is an enlarged plan view of a personal identification number input device in the payment terminal according to the second embodiment.

FIG. 5 is an enlarged plan view of a personal identification number input device according to a first modification of the second embodiment.

FIG. 6 is an enlarged plan view of a password input device according to a second modification of the second embodiment;

FIG. 7 is an enlarged plan view of a password input device according to a third modification of the second embodiment;

FIG. 8A is a schematic diagram showing a conventional card processing system. FIG. 8B is an enlarged view of a password input device in the conventional card processing system.

9A is an external perspective view of a conventional ATM. FIG. 9B is an enlarged view of a display screen for inputting a password of the ATM.

[Explanation of symbols]

1, 20, 100 Payment terminal 2, 4, 101, 103 Cable 3, 3a, 3b, 23, 23a, 23b, 23c, 10
2 PIN code input device 5, 22, 106, 202 Magnetic reading unit 6, 107 Input unit 7 First display unit 8 Second display unit 9, 25 Printer 10, 21, 105, 201 Magnetic card 11 Selected element characters 12, 30 , 30a, 30b Selected character display section 13, 31 Input character display section 14, 27, 27a, 27b Selection button 15, 28, 28a, 28b Input button 16, 29 Cancel button 17, 32 Asterisk mark 18 Liquid crystal display screen 19, 204 Touch panel 24 Cash outlet 26, 203 Display screen 104 Host device 108 Keyboard unit 109 Shielding plate 200 ATM 205 Touch key

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G06F 17/60 332 G07D 9/00 421 404 G06F 3/023 310L // G07D 9/00 421

Claims (6)

[Claims] 1. A password comprising a display screen for displaying a selected element character to be selected, a first key for selecting the selected element character, and a second key for inputting the selected selected element character. Input device for inputting. 2. The input device according to claim 1, wherein the selected element characters are displayed at random. 3. The input device according to claim 1, wherein the selected element character is displayed between the first key and the second key. 4. The input device according to claim 1, wherein the selected display character is displayed at a corner of the display screen. 5. The input device according to claim 1, wherein the display screen is a touch panel. 6. The selected first selected element character and the second selected element character.
A display screen for displaying the selected element character, a first key for selecting the first selected element character, a second key for inputting the selected first selected element character, and the second selection An input device for inputting a personal identification number, comprising: a third key for selecting an element character; and a fourth key for inputting the selected second selected element character.