Abstract: A process control method managing a semiconductor device manufacturing process, including an operation of a system with a plurality of sub-modules, including diagnosing an operational state of the plurality of sub-modules prior to beginning the semiconductor device manufacturing process, checking a process condition of the system, and informing operational states of the sub-modules and the process condition of the system to a user. With this configuration, a system for making semiconductor devices and processing control thereof prevents a malfunction of the semiconductor device manufacturing system according to a diagnosis of the semiconductor device manufacturing system prior to starting a semiconductor manufacturing process, thereby increasing yield in manufacturing semiconductor devices.