Patent ID: 7257104

Claim:
A communication processing system comprising a mobile node which is a mobile communication terminal device, said system configured such that: in a domain including at least one subnetwork, each subnetwork being associated with a physical network prefix, a virtual network prefix for the mobile node is determined as a network prefix that is different from the physical network prefix, an address is configured based on the virtual network prefix and an identifier of the mobile node, the communications process with the mobile node is performed according to the address, and a router in the domain routes a packet by performing host-based routing based on the identifier of the mobile node; wherein, when the mobile node moves between a first subnetwork to a second subnetwork in the domain or in different domains, the mobile node compares the value of the virtual network prefix which is contained in the router advertisement with the value of the virtual or physical network prefix which is contained in the address which is used in the first subnetwork; and only if the values are different, the mobile node creates an address based on the virtual network prefix which is contained in the received router advertisement serving as an information notification message.