Patent ID: 6886753

Claim:
A communication system comprising a portable card, a first terminal apparatus, and a second terminal apparatus, wherein the portable card contains an integrated device set to either a first mode or a second mode, wherein in the first mode, a predetermined process is performed and in the second mode, a process that requires higher security than the first mode is performed, the first terminal apparatus includes a first communicating unit operable to, when the portable card approaches the first terminal apparatus, set the integrated device to the first mode and then input or output data to/from the integrated device by transmitting or receiving a radio wave to/from the integrated device without contacting the integrated device, and the second terminal apparatus includes a box which contains an antenna and is electromagnetically shielded so that a radio wave having over a predetermined level of power does not leak from the terminal apparatus, and a second communicating unit operable to, after the portable card is inserted into the box, set the integrated device to the second mode and then input or output data to/from the integrated device by transmitting or receiving a radio wave to/from the integrated device without contacting the integrated device.