A system for quickly and easily optimizing the parameters of an industrial machine or solving any trouble in industrial machine is provided. A factory (100) and vendor (200) are connected through a data communication network (300). A management apparatus (120) selectively gives the operation right of an industrial machine (110) to a factory-side operation apparatus (130) or a vendor-side operation apparatus (210) arranged at a remote site. The operation apparatus having the given operation right can operate the industrial machine (110) and obtain information representing the operation condition of the industrial machine.