To easily achieve remote access service by a simple configuration as compared with a conventional network system.

An information communication terminal connected to a LAN in a house belonging to a peer-to-peer file sharing system acquires the address of a network device connected to the same network segment, creates a file, where a name given to the network device corresponds to the address, and opens the file on the file sharing system. A terminal that a user uses outside the house identifies the name and address of the network in the house for remotely accessing the network device by utilizing the function of the file sharing system for referring to the content of the file created by the information communication terminal connected to the LAN in the house. Web server-mounting equipment in the network in the house can be automatically accessed from a remote environment outside the house, or the like, thus easily utilizing the remote access service.