 access permission information recorded on the second removable recording medium, the security provided for information of the first information storage device can be improved. The access permission information may comprise write permission information for permitting the first information storage device to write information to the first removable recording medium. In this case, the access controller may permit the first information storage device to write information to the first removable recording medium when the write permission information is valid. According to the invention, write access to the first removable recording medium by the first information storage device can be restricted based on the write permission information. Hence, it is possible to prevent information from being taken away after having been recorded on the first removable recording medium, and thus, the security provided for information of the first information storage device can be further improved. The access permission information may comprise read permission information for permitting the first information storage device to read information from the first removable recording medium. In this case, the access controller may permit the first information storage device to read information from the first removable recording medium when the read permission information is valid. According to the invention, read access to the first removable recording medium by the first information storage device can be restricted based on the read permission information. Hence, it is possible to prevent information from being easily read out from the first removable recording medium, and thus, the security provided for information of the first information storage device can be improved. The access permission information may comprise a control program for controlling the access controller; and the access controller may control access to the first removable recording medium by the first information storage device in accordance with the control program. According to the invention, since the first removable recording medium cannot be accessed without the second removable recording medium 