A drawing edit management unit of a design management server manages an E-BOM created from a CAD design drawing by storing the E-BOM in a E-BOM database, and notifies a manufacturing management server of design completion. A design change display processing unit causes design change permitted ranges and forbidden ranges to be displayed, upon design change, in accordance with design change verification information of a design change verification database. A parts order management unit of the manufacturing management server requests confirmation when receiving the design completion notice, and manages a M-BOM, to which preparation information including order instructions and manufacturing instructions of a part is added and which has been created from the E-BOM after confirmation, by storing the M-BOM in a M-BOM database. A design change verification processing unit manages design change verification information created from the preparation information of the M-BOM by storing the design change verification information in a design verification database.