Patent ID: 7178737

Claim:
A combination-type IC card comprising: a contact-type interface for reading and writing data transmitted via contact terminals provided in the combination-type IC card; a non-contact-type interface for receiving, via an antenna coil, data transmitted thereto via radio waves, and for reading and writing the data thus transmitted thereto; judging means for judging whether communication is contact-type communication or non-contact-type communication, by judging from a difference between a frequency of a clock for contact-type communication, and a frequency of a clock for non-contact-type communication, the clock for contact-type communication being received via a CLK terminal, which is one of the contact-type terminals, and the non-contact-type clock being received via the antenna coil; and a selector for holding a result of judging, after the judging means judged whether the communication is the contact-type communication or the non-contact-type communication.