A position determination unit determines whether a position of the vehicle is in proximity to a carwash. A shift determination unit determines a shift position of a transmission device of the vehicle. A brake determination unit determines activation of a brake device of the vehicle. A control unit determines that a condition to implement a carwash preparation is satisfied when the position determination unit determines that the position of the vehicle is in proximity to the carwash, when the shift determination unit determines that the shift position is in a neutral position, and when the brake determination unit determines that the brake device is deactivated.