To provide a method for controlling a route capable of selecting a link having a stable availability condition as an optimum route, and to provide an apparatus and a program.

The method for controlling the route icnludes: a first step of monitoring a periodically-received link state message; a second step of timing an accumulated availability time for an evaluation time with the link state message; a third step of calculating the availability rate by the accumulated availability time for the evaluation time each link; a fourth step of calculating an integrated availability rate with the availability rate of each link integrated each route for going through a plurality of links; and a fifth step of selecting the route having a maximum accumulated availability rate within the plurality of routes.

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