Access control systems, as well as the access control device to be used therewith, and the resource providing device

Immediately discards the access permission to be discarded, and to prevent unauthorized use of the device providing a resource. In the access control device 10, the communication unit 101 communicates with the resource use device 30 and the resource providing device 20. Permissions 106, so as to allow access from the resource use device 30, via the communication unit 101 instructs to the resource providing device 20. Storage unit 103 stores information on the resource use device to which access is permitted by the access permission unit 106 as the management information. Existence check unit 107 checks a communication state with the resource use device 30 to the management information in the storage unit 103 is stored via the communication unit 101. Access discard unit 108, so as to deny access from the resource use device 30 it is determined that the interrupted communication by the presence confirmation unit 107 instructs via the communication unit 101 to the resource providing device 20.