Placement/net wiring processing system

A placement/net wiring processing system uses an interactive editor which eases and simplifies operations for placing or moving cells and adding, deleting or modifying wiring. The placement/net wiring processing system comprises a control means for controlling the execution of a placement and wiring operating and processing program, a display means for displaying placement and wiring information on a screen, an operating and processing means for operating the placement and wiring on the screen, and an information management means for managing the placement and wiring information. The control means copies the program read out thereby and afterwards executes the program. The display means displays the contents of the placement and wiring graphic information on the screen in accordance with the selection and relates processing-related information associates with placements and wiring which are read out of a storage division and designated by user to the placement and wiring graphic information for display on a screen.