To easily seize in which process a specific product is positioned by providing product agents for informing positional information on products by indicating work of the products, and displaying a process monitoring image screen of a present process of the products on a display means on the basis of the positional information of these product agents.

A production control computer 11 controls a kind of manufacturing product and the manufacturing number, and transmits these information to control computers 12A to 12D. The control computer 12A to 12D are respectively connected to control apparatuses 13A to 13D to perform work on products 14A, 14B by a machine tool controlled by the respective control apparatuses 13A, to 13D. Product agents 20A, 20B are arranged one to one to the products 14A, 14B to go from place to place in the control computers 12A to 12D according to the manufacturing procedure. Device agents 30A to 30D gather process monitoring information to be informed to the product agents 20A, 20B to display positional information and the process monitoring information on the products 14A, 14B by a display means 40.