In a mobile terminal (10), a position information which is received by a position information detecting section (12) is transmitted to a base station. A determining section (34) in the base station determines whether or not the received position information indicates a non-communication area which is then stored in a memory device (35). If the position information indicates a no-communication area, a communication impossible information is transmitted to the mobile terminal (10). When the communication impossible information is received, a wireless communication section (19) in the mobile terminal (10) is notified that a network is disconnected. By putting out a network disconnection request by a communication controlling section (36), the network is disconnected. Consequently, use of the mobile terminal is prohibited in an area where a mobile terminal should preferably be restricted.