PROBLEM TO BE SOLVED: To provide a fluid state control device and a fluid state control method that can easily render a gas-liquid two-phase fluid into a desired fluid state.SOLUTION: The fluid state control device 100 which renders a gas-liquid two-phase fluid flowing through a supply tube into a predetermined fluid state includes: an information acquisition unit 110 that acquires pressure information pertaining to the pressure of the fluid, mass velocity information pertaining to the mass velocity of the fluid, and dryness information pertaining to the dryness of the fluid; and a control unit 120 that, on the basis of the pressure information, the mass velocity information and the dryness information, controls a pressure regulator valve 31 that can alter the pressure of the fluid, a pump 11 and throttling valve 12 that can alter the mass velocity of the liquid, and a heater 32 that can alter the latent heat of the liquid.
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