A control apparatus configured to control an automatic transmission to which a driving force of an engine is input includes a detection unit provided in the automatic transmission, and a processing unit configured to generate load information concerning a load on the automatic transmission based on the detection result of the detection unit and transmit the load information to the control apparatus of the engine. The processing unit transmits dummy information that is not based on the detection result of the detection unit as the load information at least on condition that the automatic transmission is in an operation state in which a load on an input shaft is released.