unit 340 acquires access information including the presentation url information of the upnp device for which access information has been requested by the access information request receiving unit 330 from the home network database 360 and acquires information about the private ip address and the port numbers of the upnp device by using the presentation url information included in the acquired access information the port forwarding information managing unit 340 transmits a message for requesting setting up port forwarding including the acquired private ip address and port numbers of the upnp device to the remote access agent not illustrated in response to the port forwarding setting up request message the remote access agent sets up port forwarding for the upnp device by using the private ip address and the port numbers of the upnp device included in the received port forwarding setting up request message and transmits the set external port number information to the access information managing unit 350 the port forwarding information managing unit 350 transmits the external port number information received from the remote access agent to the access information managing unit 350 the access information managing unit 350 corrects the presentation url information of the upnp device by using the information about the external port numbers set by the remote access agent for the upnp device received from the port forwarding information managing unit i e the upnp device for which access information has been requested.