CONTROL OF CLOSED NETWORK USING NETWORK SLICE

To facilitate external access to a certain network while maintaining a high security level, a communication system authorizes, based on a permission request relating to a terminal connectable to a network slice of a closed network, the network slice of the closed network as a network slice to which connection via a specified radio device which is a part of a plurality of base station radio devices is permitted (S103 and S104). After the network slice of the closed network is added, the communication system sets a communication path between the terminal connected to the network slice of the closed network via the specified radio device and a service system connected to the network slice of the closed network (S204). After communication via the specified radio device is finished, the communication system cancels the authorization of the network slice of the closed network as the network slice to which connection via the specified radio device is permitted (S303 and S304).