IC card and communication system using IC card

An IC card comprising:

• radiocommunication means for performing radiocommunication with a first infrastructure;
• an interface to be connected with an external communication apparatus for performing radiocommunication with a second infrastructure which differs from said first infrastructure;
• memory means for storing data distinguishing said first infrastructure from said second infrastructure;
• controlling means for selecting, in accordance with a command from a data processor, one of the first and second infrastructures based at least upon the data distinguishing the infrastructures stored in said memory means, and for controlling communication between said data processor and the infrastructure which has been selected;
• wherein said IC card to be connected with the external communication apparatus through said interface, and communication between said IC card and said second infrastructure is carried out via said external communication apparatus;
• and
• means for, when said first infrastructure has been requested in the command but data cannot be received from the requested first infrastructure, switching to communication with the second infrastructure even though the first infrastructure and not the second infrastructure had been requested in the command.