PURPOSE: To shorten the waiting time of a user and to improve the instantaneousness and conformity by providing an interface conversion part with a memory means and a data transfer means which transfers all data stored on an IC card to a memory means.
CONSTITUTION: The interface conversion part 3 is provided with the memory means which has larger memory capacity than the IC card. When the IC card 1 is inserted into an IC reader 2, the data transfer means 32 in the interface conversion part 3 transfers all the data stored on the IC card 1 to the memory means 31. The interface conversion part 3 accesses the data in the memory means in response to a read command from a data processing part 4 and transfers them to the data processing part 4. Consequently, a response to the command from the data processing part 4 is made in a short time.