An authentication information and a verification information are previously generated and the authentication information is stored to an authentication data generating apparatus, while the verification information is stored to a gateway. When a controller tries to make communication With a customer premises apparatus, the authentication data generating apparatus connected to the controller generates an authentication data using the authentication information and the gateway verifies the authentication data using the verification information. Moreover, the gateway restricts, when connected to the authentication data generating apparatus, the communication between the controller located in the outside of customer premises and the customer premises apparatus. Moreover, the gateway changes, while connected to the authentication data generating apparatus, an address of the customer premises apparatus and stores the changed address to the authentication data generating apparatus. The address of the customer premises apparatus is not informed to the controller provided in the outside of customer premises. Consequently, a system for safely controlling the customer premises apparatus from the outside of customer premises with the controller without bringing this controller into the customer premises to register a controller identification information to the gateway can be provided.