Abstract: In a mobile communication network system for locking an operation on a cellular telephone comprised of a cellular telephone body, and an information storage medium that is inserted in the cellular telephone body and that is assigned a specific telephone number, provided are a service control apparatus that associates a terminal identification number assigned to the cellular telephone with the telephone number of the information storage medium currently inserted in the cellular telephone to manage, and an information management server which acquires a telephone number of the information storage medium corresponding to the terminal identification number of the cellular telephone targeted for locking from the service control apparatus, and locks the operation on the cellular telephone based on the telephone number.

Abstract: In a mobile communication network system for locking an operation on a cellular telephone comprised of a cellular telephone body, and an information storage medium that is inserted in the cellular telephone body and that is assigned a specific telephone number, provided are a service control apparatus that associates a terminal identification number assigned to the cellular telephone with the telephone number of the information storage medium currently inserted in the cellular telephone to manage, and an information management server which acquires a telephone number of the information storage medium corresponding to the terminal identification number of the cellular telephone targeted for locking from the service control apparatus, and locks the operation on the cellular telephone based on the telephone number.

Abstract: A semiconductor backing storage device is connected to a computer system accessible only in magnetic disc access mode for improvement in access time. In transferring information data between the computers and the semiconductor backing storage device, access control command signals peculiar to magnetic disc access mode are all disregarded and address data peculiar to magnetic disc access mode are converted into those necessary for semiconductor memory mode in writing or reading information data. To further decrease access time, one-word buffers are provided for a semiconductor backing storage controller and the backing storage device, so that the preceding data are transferred from the buffers while the current data are transferred to the buffers after necessary processing. The semiconductor backing storage memory is also usable for a multicomputer system by providing cross-call function for the semiconductor backing storage controller.