| 摘要 |
PROBLEM TO BE SOLVED: To minimize damages by illegal write even in the case that a charging machine is stolen and a card is illegally written by the stolen charging machine. SOLUTION: Areas #1-#9 for recording value information are provided in the memory 12 of this IC card 1 and the area 12A for storing the address of the areas #1-#9 is provided. In this case, at the time of issuing the card 1, the area #9 is selected by the address of the area 12A and the value information is recorded (b). Then, a user purchases a product and subtraction is performed from the area #9 at the time of adjusting a charge (c). When the balance of the area #9 is used all (d), the address of the area 12A is subtracted, the next area #8 is selected, the value information is recorded and issuance is performed again (e). In such a manner, the value information is successively recorded in the final area #1, and when it is used and becomes '0' (f), the use of the card is inhibited. |
