 provided with the control program recorded thereon, the security provided for information of the first information storage device can be improved. The information storage system may further comprise a control program setting part for validating or invalidating the control program. In this case, the access controller may control access to the first removable recording medium by the first information storage device in accordance with the control program when the control program is validated by the control program setting part; and the access controller may control access to the first removable recording medium by the first information storage device irrespective of the control program when the control program is invalidated by the control program setting part. According to the invention, 