PROBLEM TO BE SOLVED: To provide a mobile router ad-hoc network communication system capable of preventing a mobile router becoming a transmission source of a router advertisement message from becoming a loop path in another mobile router due to reselection thereof as its own parent.;SOLUTION: In a downstream mobile router having received a router advertisement message from a mobile router MR1-1 located at a route position of a tree structure, a packet for which one of a mobile network accommodated by a mobile router located on the downstream side, a mobile network accommodated by a mobile router located on a tree route from itself to a route, a mobile network where a mobile router being its own parent node can transfer packet via a tree route is a destination is transferred via the tree route, and when none of the mobile networks is a destination, route search is performed using ad-hoc route control to establish an ad-hoc route, and the packet is transferred via the ad-hoc route.;COPYRIGHT: (C)2011,JPO&INPIT
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