Abstract: An authentication system includes a communication unit that originates a call on the basis of an entered telephone number, a vibration reception unit that receives vibrations generated by a portable device in response to an incoming call, vibration pattern registration unit registering a vibration pattern, and an authentication unit that performs authentication by determining whether or not a vibration pattern of the vibrations received by the vibration reception unit matches the vibration pattern registered in the vibration pattern registration unit.

Abstract: Connection information of an access point and authentication information of a terminal connected by a wireless LAN are set by an instruction from an access point setting terminal. A memory card in which the set information and the authentication information have been copied is connected to the terminal and the setting of the terminal is made. A combination of an MAC address of the terminal and the authentication information is registered into an association table of the access point. When the combination of the MAC address and the authentication information received by a connecting request is correct, the connection is permitted. The registration of the MAC address and the authentication information by an illegal use terminal is deleted in association with erasure of the set authentication information in order to copy into the memory card again and the subsequent connection of the illegal use terminal is refused.