To provide a system by which an FPGA in an adapter card in the middle of suspending operation can be used as a part of another adapter card without being wasted.

Each adapter card has the re-programmable FPGA, a ROM in which circuit information for the card to operate singly and circuit information for plural cards to operate in cooperation are written, and an adapter control circuit for controlling the respective cards to operate in cooperation. In a device main body, an FPGA sharing control circuit for controlling the respective cards to operate in cooperation with the adapter control circuit and a main body circuit I/F for connecting the signal of a main body circuit and the signal of the FPGA.