Abstract: There is installed a special management node to efficiently perform network configuration management. When a node starts communication with another node, the node sends a request for node position information about the communication counterpart node to a management node. Upon receiving the node position information request, the management node references a network configuration information table to calculate information about a route from the node to the communication counterpart node. The management node notifies the calculated route information. By utilizing the route information, the node can communicate with the communication counterpart node. Each node notifies node-to-node connection information, information about links with adjacent nodes, to the management node as necessary.