To provide an automatic relaying route setting function on the occurrence of a fault to a radio relay system comprising a plurality of monitor stations and a plurality of stations to be monitored.

Each of stations (0100, 0101 to 0104,...) in the radio relay system is provided with: a radio communication means for executing transmission/reception for other wireless communication means mutually via a radio channel; a means for storing relay control data that include information of relay stations selected among the stations above by using a destination station being a final destination described in a communication message of a transmission object for a key, the number of relay times reaching the destination station via the selected relay stations, and priority for selecting the relay stations in response to the number of relay times; and a means for selecting the relay stations according to the destination station and the priority in the stored relay control data.

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