1. A radio communication terminal having a relay route setting part for setting a relay route of a transmission packet to one of nodes in a multihop communication network in accordance with a discrimination result which is obtained by a route searching process of said multihop communication network, a transmitting part for transmitting said transmission packet through said set relay route, a receiving part for receiving a reception packet through said multihop communication network, and an application data processing part for processing application data included in said reception packet, comprising: a backup route storing part for storing said relay route as a backup route regarding said one node; a route change setting part for obtaining said backup route from said backup route storing part from said relay route setting part in accordance with a detection of an obstacle by said application data processing part and changing and setting the obtained backup route as said relay route regarding said one node; and a transfer destination change command generating part for generating a transfer destination change command indicating that a transfer destination node of the transfer packet due to said one node should be changed in accordance with the detection of the obstacle by said application data processing part and transmitting said transfer destination change command from said transmitting part to said one node after said relay route setting part has set said relay route.