An electronic control apparatus includes a vehicle state storing processing part, which stores a vehicle state data when a predetermined trigger is generated, and a trigger setting processing part, which sets the trigger in correspondence to a designation from an external side. The electronic control apparatus further includes a data type setting part for setting, based on the designation from the external side, a stored vehicle state data type. The vehicle data storing part stores the vehicle state data in different addresses. The trigger setting part sets the trigger based on the address designated from the external side and a data length of the vehicle state data stored in the address. The data type setting part sets the stored vehicle state data type based on the address designated from the external side and the data length of the vehicle state data stored in the address.