A wireless route control method, comprising: broadcasting a control signal from a first wireless node among a plurality of wireless nodes (CN, SN) that form a tree-structured backhaul network to a second wireless node among the plurality of wireless nodes (CN, SN), the first wireless node being a root node connected to a backbone network, the control signal being used for selecting a parent node in a backhaul route; broadcasting, by a second wireless node that has received the control signal, the control signal to another one or more of a plurality of second wireless nodes; acquiring, by each of the plurality of second wireless nodes, an indicator indicative of a radio wave propagation quality of a route through which each of a plurality of the control signals received through different routes has propagated, the indicator being calculated based on a wireless signal transmitted by another one or more of the plurality of wireless nodes (CN, SN); selecting, by the plurality of second wireless nodes, one of upstream nodes as a parent node, based on the indicator; broadcasting, by a fixed wireless node (non-VSN) set as a fixed node among the plurality of second wireless nodes, the control signal to another one or more of the plurality of second wireless nodes; and terminating, by a mobile wireless node set as a mobile node among the plurality of second wireless nodes, the control signal, wherein the fixed wireless node (non-VSN) and the mobile wireless node that have selected the parent node constitute the backhaul route; the fixed wireless node (non-VSN) and the mobile wireless node perform wireless communication using a common frequency, the common frequency being of a backhaul line, the backhaul line comprising the backhaul route; and the mobile wireless node performs handover from a first fixed wireless node (non-VSN) of the backhaul line to a second fixed wireless node (non-VSN) of the backhaul line, using the common frequency. broadcasting a control signal from a first wireless node among a plurality of wireless nodes (CN, SN) that form a tree-structured backhaul network to a second wireless node among the plurality of wireless nodes (CN, SN), the first wireless node being a root node connected to a backbone network, the control signal being used for selecting a parent node in a backhaul route; broadcasting, by a second wireless node that has received the control signal, the control signal to another one or more of a plurality of second wireless nodes; acquiring, by each of the plurality of second wireless nodes, an indicator indicative of a radio wave propagation quality of a route through which each of a plurality of the control signals received through different routes has propagated, the indicator being calculated based on a wireless signal transmitted by another one or more of the plurality of wireless nodes (CN, SN); selecting, by the plurality of second wireless nodes, one of upstream nodes as a parent node, based on the indicator; broadcasting, by a fixed wireless node (non-VSN) set as a fixed node among the plurality of second wireless nodes, the control signal to another one or more of the plurality of second wireless nodes; and terminating, by a mobile wireless node set as a mobile node among the plurality of second wireless nodes, the control signal, wherein the fixed wireless node (non-VSN) and the mobile wireless node that have selected the parent node constitute the backhaul route; the fixed wireless node (non-VSN) and the mobile wireless node perform wireless communication using a common frequency, the common frequency being of a backhaul line, the backhaul line comprising the backhaul route; and the mobile wireless node performs handover from a first fixed wireless node (non-VSN) of the backhaul line to a second fixed wireless node (non-VSN) of the backhaul line, using the common frequency.