Variation of the constants in the late and early universe
A manufacturing process system includes: a plurality of processing devices which processes workpieces, with respective equipment associated with the plurality of processing devices; a transfer device which transfers the workpieces to the plurality of processing devices; a host computer which performs creating a transfer plan including information of timings at which the workpieces are carried in and out by the transfer device and acquiring an operation schedule including information of maintenance time from the plurality of processing devices; and a processing device group controller which performs acquiring the transfer plan and the operation schedule from the host computer, comparing the transfer plan and the operation schedule of each processing device, specifying the last process before maintenance for each processing device, detecting the end timing of the specified process, and instructing each processing device to be switched to an idle state at the end timing along with the associated equipment.