| 摘要 |
PROBLEM TO BE SOLVED: To effectively prevent the forgery, etc., of money data and also to easily detect an illegal transaction. SOLUTION: In an electronic money system in which electronic money is transacted by using an electronic money card 19 that stores electronic money having a money value, what is provided with an IC part 20 and an optical storing part 21 is used as the card 19. The part 20 records information which specifies the card 19, the balance, information that accesses the part 21, etc., and the part 21 records the entire history of electronic money transactions which are performed by using the electronic money card. The transaction history is also registered in a computer of an electronic money transaction system. The occurrence place of illegality, the amount of a sum, etc., are detected by tracking the transaction history. |
