The present invention provides a control apparatus which includes a load predicting part configured to predict, based on current load information of an engine rpm controlling part, a load of the engine rpm controlling part at a time point which is a predetermined time ahead of the present time point, the engine rpm controlling part being configured to control an engine rpm; and an engine rpm reducing part configured to reduce the engine rpm if the load predicted by the load predicting part is greater than or equal to a first threshold.