A server apparatus controls an FC card α so as to access a disk array apparatus A. The FC card α obtains response information sent from the disk array apparatus A in accordance with the present access. If the response information is a predefined specific access error in this event, the server apparatus controls the FC card α so as to change the address of the present access to that of a disk array apparatus B that is different from the sender of the present response information, and then access the present post-change address.