Patent ID: 8369293

Claim:
A method for managing a position of a terminal in a mobile network system, the mobile network system including a plurality of mobile networks and a home network, the plurality of mobile networks being interconnected with one or more mobile routers and the terminal, the home network including a home agent for managing positions of the plurality of mobile networks, comprising: detecting, by the home agent, whether or not the terminal having a terminal address based on a network prefix that is common to the mobile networks and the home network is connected to the home agent, when data addressed to the terminal arrives at a home network; inquiring, by the home agent, a mobile router of a mobile network whether or not the terminal having the terminal address is connected to the mobile network, by utilizing a unique network identifier of the mobile network; searching, by the mobile router in response to the inquiry whether or not the terminal is connected to the mobile network to which the mobile router belongs, and if the mobile router determines that the terminal is connected to the mobile network, informing the home agent of presence of the terminal; and transferring, by the home agent, the data addressed to the terminal from the home agent to the mobile router that has informed of presence of the terminal, by utilizing the unique network identifier of the mobile network, wherein the mobile networks are not sub-networks of the home network.