JOB HISTORY COMPLEMENTING METHOD FOR EDI CUSTOMERS

To provide a method of complementing history information on a job, which has been performed by a company incapable of acquiring information on a level on which individual products can be discriminated from one another (hereinafter called an individual level), by utilizing business deal information, which is transferred through EDI (hereinafter called an EDI message) as long as one of two companies that make a business deal with each other through EDI can acquire job history information while discriminating the individual products from one another. In a turnaround deal to which an ID that uniquely specifies the deal is assigned (hereinafter called a deal number) in relation to a series of jobs that starts with ordering succeeded by shipment and receipt, testing, acceptance inspection, and payment, a job history is complemented by performing calculation on an individual level using a deal number as a key on the basis of EDI messages containing the deal number and job history information of the individual level acquired during any of the series of jobs. At this time, the number of records in the acquired job history information of the individual level is inconsistent with a value of a quantity acquired from the EDI message, a probability value or a virtual ID is used to complement the job history.