The uplink signal circuitry of the base station device includes an authenticating unit, an access right setup unit, and a changeover switch for changeover between the setup of the access right and the authentication process. When a user performs the operation of setting up the right to access to the base station device, the changeover switch is flipped to select the access right setup unit. The access right setup unit executes authentication process on the basis of the IMSI (code unique to user terminal) sent from the user terminal. If the result of authentication is successful, the IMSI of the user terminal is registered in the authentication memory. Thereafter, the changeover switch is flipped to select the authenticating unit to authenticate the user terminal on the basis of the IMSI of the user terminal registered in the authentication memory. The authenticated user terminal is then connected with an upper device.