An operation rule extraction device includes a combination generation unit; a recording unit, a simulation unit, a trial operation unit, an optimal point search unit, and an operation rule extraction unit. The combination generation unit identifies variable ranges of a plurality of control input variables, and generates a combination of the plurality of control input variables. The recording unit associates a plurality of pieces of information including an external condition provided to the target device, a combination of a plurality of control input variables, an output value of the target device, and a confidence degree, and records a plurality of such sets. The simulation unit performs simulation of the target device, based on an external condition and a combination of a plurality of control input variables. The trial operation unit performs trial operation of the target device. The optimal point search unit searches for an optimal operation point.
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