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; and 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.