Root mobile router and operation method thereof in dynamically composed moving network

A root mobile router in a dynamic mobile network and its operation method are provided to utilize a mobile terminal as a mobile router in a situation that a mobile object does not have a function as a mobile router. A network selecting module(411) selects a connection network suitable for a mobile network or determines whether a previously selected connection network has been changed or not. A handover processing module(412) maintains connectivity between each mobile node connected with a mobile router of the mobile network and the Internet through the connection network. A routing protocol module(416) transfers an IP packet generated from the mobile node to the Internet through the connection network. A root mobile router selecting module(415) selects one of a plurality of mobile routers and sets it as a root mobile router. When a central control module(414) receives selected connection network information from the network selecting module(411), it calls the routing protocol module(415) to change the connection network, and when the central control module(414) receives information on a failure of the mobile network, it calls the root mobile router selecting module(415) to change the root mobile router.