This invention provides an integrated support system for supporting sheet metal machining adapted to store and reuse the know how of skilled machine operators and improve the quality of sheet metal products and the rate of operation of machine tools by shifting the arrangement operation from the actual machining phase to the design phase. An integrated support system for supporting sheet metal machining according to the invention is adapted to collect actual machining information obtained during the actual machining process on the machining site and site-specific attribute information that provide the basis for actual machining data and feed back the collected actual machining information and the site-specific attribute information to a sheet metal machining data storing means containing machining information for controlling the machine tools and machining support information relating to the machining information. An integrated support system for supporting sheet metal machining according to the invention verifies the profile of the product to be machined and/or the machining sequence in advance on the design site and stores the sheet metal machining information obtained by the verification in the sheet metal machining data storing means.