| 摘要 |
PURPOSE:To eliminate necessity to input a personal identification code by providing an encoder to increase the prepaid remainder of a prepaid area in an IC card for an amount in the range of the off-line remainder of an off-line account area, to write the prepaid remainder, simultaneously to decrease and write the off-line remainder of the off-line account area. CONSTITUTION:A first PIN (a system code common for systems) is sent to an IC card 1 and the transaction amount is subtracted from the prepaid amount of a prepaid area 2a and written by accessing the prepaid area 2a. When the prepaid remainder of the prepaid area 2a in the IC card 1 is made a little or lacked, a part of the off-line remainder of an off-line area 2b in the IC card 1 is added to the prepaid remainder of the prepaid area 2a in the IC card 1 by using an encoder 11. In such a case, in order to access the off-line area 2b of the IC card 1, it is necessary to input the personal identification code (the second PIN.) Thus, when transaction is executed, it is not necessary to input the personal identification code. |
