An object is to provide a script description separation reconstructing device that can describe the same operation by the same command script regardless of a subsystem configuration of a controlled system, a configuration of a control system, and a kind of the command script. Using system configuration information indicating what kind of subsystem structure the controlled system is composed of, A script description separation reconstructing means reconstructs in a form of separating a system control command script description into a process inside each controller and a process by a host side.