| 摘要 |
PROBLEM TO BE SOLVED: To provide a system in which an invalidation procedure for a token lost by a user can be performed easily, and unauthorized use of the token can be prevented.SOLUTION: When performing electronic money settlement, a terminal device 4 reads an individual number of a child token 3 held by a user, and transmits a settlement confirmation request including the individual number of the child token to a token management device 5; a token management device 5 transmits, when the individual number of the child token included in the settlement confirmation request is registered in the token management device 5, a settlement approval notification to the terminal device 4;the terminal device 4 performs electronic money settlement by using the child token 3. When invalidating the child token 3, the terminal device 4 reads the individual number of a parent token 2 held by the user, transmits a token invalidation request including an individual number of the parent token to a token management device 5, and invalidates the individual number of the child token 3 associated with the individual number of the parent token in the token invalidation request. |
