To provide a system environment capable of using a PCI card (PCI board) even for a compact equipment such as a portable computer on which a PCI bus is loaded and developing a card bus card having a card bus specification similar to the specification of the PCI bus and a card bus controller for controlling access to the card bus card.

A PC card connector terminal 21 is formed on the inserting direction tip part of a slot inserting part 20a to be inserted into a card slot (SLOT), a PCT card connecting connector 22 is formed on a PCI card loading part 20b exposed from the SLOT, and when the slot inserting part 20a is inserted into the SLOT of a PC body 1 by prescribed depth, the terminal 21 is connected to a card connection connector 12 and a PC card controller (PCCard-Cont) 11 can access a PCT card 30.