PURPOSE: To reduce the size of an energy system, to reduce power consumption, and to effectively utilize energy by selecting and freely driving a drive source, necessary to drive of a complex function, according to machining of a work.

CONSTITUTION: During a punch work, a hydraulic pump 11 and a drive motor 13 are driven. By operating a switching valve 15, pressure oil in an oil tank 31 is fed to the hydraulic cylinder 7 of a punch press 3 to repeat a punch work. In this case, a cooling water switching valve 21 is energized, no cooling water flows to the laser beam machine 5 side, the cooling water flows to an oil cooler 25 and is applicable to only cooling of an oil pressure under a punch work. Further, a laser oscillating power supply 29 is not energized. During a laser beam machining work, the hydraulic pump 11 and the drive motor 13 are stopped, the cooling water switching valve 21 is not energized, and cooling water is fed only to a cooler 27 for a laser discharge pipe 9.