| 摘要 |
In a mobile terminal device to be attached detachably with an information storage medium having an electronic money function, authentication is executed between the information storage medium and the mobile terminal device and, when the authentication is successfully completed, the electronic money function of the information storage medium is made executable. The information storage medium 30 stores electronic money information and includes a nonvolatile memory 33 registered with at least one mobile terminal device, an interface 31 that connects to the mobile terminal device, and an electronic money controlling unit 32 . The electronic money controlling unit 32 authenticates whether a mobile terminal device connected to the interface 31 is a mobile terminal device registered in the nonvolatile memory 33 and permits the mobile terminal device for which the authentication is successfully completed to make an access to electronic money information. The information storage medium 30 permits connection of an external antenna to transmit and receive the electronic money information when the mobile terminal device connected to the interface 31 is permitted to make an access to the electronic money information.
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