CONTROL DEVICE AND CONTROL METHOD

Provided is a control device for an internal combustion engine, which can control an injection amount of water injected into each cylinder of the internal combustion engine to a minimum injection amount that allows knock to be suppressed for each cylinder. Therefore, in a control device that controls water supply valves (water supply devices) that supply water into each of combustion chambers of a plurality of cylinders R (cylinders R to R in the embodiment) of an internal combustion engine the control device includes a water supply amount calculation unit that calculates a supply amount of water supplied to each of the combustion chambers of the plurality of cylinders R to R for each cylinder, and a water supply control unit that controls the water supply valves based on the supply amount of water calculated by the water supply amount calculation unit for each cylinder.