Method of controlling an information transmission network system

An NME that cannot communicate with an SSE to which the NME is to be connected by default gives a detouring process start instruction to the SSE of an adjacent station. In response to this, the SSE of the adjacent station acting as a detour acquires the configuration information and summary information from the nodes in the station to which the faulty SSE belongs. Then, the addressee of the notification sent from the nodes is changed from the faulty SSE to the SSE of the detour station in rewriting.