IP based network system and networking method thereof

PURPOSE: An Internet-based network system and a communication method therefor are provided to easily connect devices in a network through the Internet at any time and anywhere by forming an IP-based network in dummy devices as well as intelligent devices. CONSTITUTION: A lookup server(22) registers information a plurality of devices, and provides information to the second device when the first device requests information the second device. A DNS(Domain Name Server)(18) provides host names to the devices in a network. A DHCP(Dynamic Host Configuration Protocol) server(20) assigns private IP addresses to the devices in the network. In case of the devices in the network are dummy devices, a service agent(16) manages the dummy devices. The service agent(16) requests the DHCP server(20) to assign the private IP addresses to the dummy devices.