Gross output power of the engine (12) to be distributed at least one of the main machine (14) to one or more auxiliary machine (15), the performance with sufficiently exhibit the major machine (14), the engine (12) to prevent deterioration of fuel efficiency, it is controlled. Total load value calculation unit (222), the value of loss power consumed by the auxiliary machinery (15) calculates the target value for the primary output power of the engine to be distributed to the main machine (14) (12) by adding to the loss power value, it calculates the value of the sum of the power to be supplied to the main machine (14) and the auxiliary machine (15) total load power. Gross output value control section (223), when the value of the total load power is smaller than a predetermined threshold value, controls so that the value of the gross output power total load power value, when the total load power value is greater than the threshold value , it controls the gross output power value to be the threshold value.