Authenticating method of communicating connection, gateway apparatus using authenticating method, and communication system using authenticating method

A gateway apparatus comprising:

• an authentication processing unit to receive at least one of authentication information and first intrinsic identification information that is intrinsic identification information of a terminal from the terminal and authenticate communicating connection by using at least one of the first intrinsic identification information and the authentication information;
• and
• an authentication key generating unit to, when the authenticating is successful, generate at least one authentication key by using at least one of the first intrinsic identification information and second intrinsic identification information that is intrinsic identification information of the gateway apparatus.

A communication system comprising a mobile terminal and a gateway apparatus, wherein the mobile terminal transmits at least one of authentication information and first intrinsic identification information that is intrinsic identification information of the terminal from the terminal to the gateway apparatus and requests the authentication of communication connection between the mobile terminal and the gateway apparatus, and

• wherein the gateway apparatus authenticates the communicating connection by using at least one of the first intrinsic identification information and the authentication information, and generates at least one authentication key by using at least one of the first intrinsic identification information and second intrinsic identification information that is intrinsic identification information of the gateway apparatus, when the authenticating is successful.