To perform progress control over manufacturing stages and to contribute to the improvement of productivity, etc.

Information regarding operation stages needed to manufacture respective products is inputted to a management control part 10 which manages the operation stages needed to manufacture the products together with the lot numbers of the respective manufactured products while given the lot numbers by the products. The management control part 10 creates an operation instruction document where the information regarding the operation stages inputted to the management control part 10 and the lot numbers of the products are represented as linear and two-dimensional codes. When the operation instruction document is supplied to the respective operation stages and specific operations are performed for components, etc., the codes regarding the operations of the operation instruction document and the codes regarding the lot numbers are read by a code read means 17 and inputted to the management control part 10.