(57) [Abstract] [Purpose] The present invention is mainly characterized in that to construct a personal computer system of the communication function built which does not require external external modules and connectors. [Configuration] The present invention includes a personal to the IC card 21 an external module (DAA) 24 that houses an impossible mounted components in the connector 23 of the modular jack such as, for example, be connected to the module to function realizing control circuit for is incorporated It was built in the computer main body 22, and is characterized in that it realizes the personal computer system of the communication function built which does not require external external modules and connectors.
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