Abstract: A business operation management system has a data bank which includes a rule database for registering data relative to rules of how to proceed with work, including data relative to business operation management manuals prescribed with respect to respective themes including business plans and new product development plans, a project management database for registering management data relative to details of each of the themes, a change management database for registering contents of changes in the management data, a problem management database for registering data indicative of rejected confirmed results, a technical report management database for registering solutions to problems and data indicative of accepted confirmed results, a reference classification management database for registering instruction contents, and a know-how management database for registering know-hows extracted from problems and confirmed results.