A control device for an internal combustion engine includes a fuel injection device that injects a fuel in accordance with a required injection amount that is required for combustion in a combustion chamber that is performed to produce an output of the internal combustion engine, and a fuel property specific determination device that specifically determines a fuel property of the fuel injected. The control device further includes a control device that performs an output correction process of controlling at least a portion of the internal combustion engine so as to correct the produced output based on a difference in the specifically determined fuel property. According to the control device and a control method thereof, driveability is secured even in the case where a blended fuel is used during a high load region of the internal combustion engine.