Route control method and route setting device

A route control method comprising:

• preparing learning units for each of a plurality of paths having a source point router and a destination point router as an identical router in a communication network including a plurality of routers;
• accumulating, in the learning units prepared in each of the plurality of paths, traffic information of all of the plurality of routers in the communication network and congestion information of the each of the plurality of paths, wherein the traffic information includes a queue length, a number of packet arrivals, and a packet discard rate of each of the plurality of routers;
• performing machine learning for the each of the plurality of paths using the accumulated traffic information and the accumulated congestion information as teacher data, wherein the machine learning is performed by the learning units;
• performing congestion prediction based on results of the machine learning for the current traffic information, the congestion prediction being performed by each of all the learning units;
• and
• setting one path predicted not to be congested for a path from the source point router to the destination point router.