| 摘要 |
PROBLEM TO BE SOLVED: To secure the convenience of a user and the safety of card usage.SOLUTION: When a management server 2 is notified of the issue request of an alternative number from an issue request means 1a of a user terminal 1, an alternative number issuing means 2b authenticates a user, and issues the alternative number to which usage restriction is added, and notifies the user terminal 1 of the alternative number. Also, the alternative number and usage restriction are stored in management information storage means 2a as alternative number information. In transaction, a store server 3 transmits a transaction request in which an alternative number 4 input by the user has been added to transaction content to the management server 2. In the management server 2, a collation means 2c determines the possibility/impossibility of transaction with the alternative number 4 based on the usage restriction of the alternative number information. Then, when the transaction is possible, the transaction is executed. |
