| 摘要 |
PROBLEM TO BE SOLVED: To suppress the reduction of visibility by keeping the security of password number key and reducing soiling caused by push-down at a fixed position by changing a password number key image at random for every transaction. SOLUTION: When the key of money reception transaction 31 in an operation start picture 31a is pushed, a ten key 33 is displayed on a password number input picture 32a. The positions of ten key 33 are displayed by the coordinate positions of positions (a)-(d) (33a-33d) and these display positions are changed based on a random number for every transaction. The start of ten key position judgement is executed after the completion of input on the operation start picture 31a and a display control means extracts the random number for deciding a ten key display start position P (x, y) and finds ten key display start positions αx and βy. Afterwards, the input range of each ten key 33 is set corresponding to input range setting start coordinate position (x+αx, y+βy). Thus, the coordinate position to display the ten key 33 is decided. |
