PROBLEM TO BE SOLVED: To prevent a market failure by calculating a real profit from the profit of the 1st sale time, deciding the 2nd sale time when the sale profit equal to the real profit is obtained, and defining the difference between the 1st and 2nd sale times as the total time to be added to the total design verification time. SOLUTION: A total design verification time calculation means calculates a real profit Ui, i.e., the difference between the total profit of 1st sale time (i) and the quality loss cost, i.e., the total failure repair expenses needed up to the time (i) (1501). The profit Ui is substituted for (y) defined as a change (total profit/total sales) of y=K/ 1+exp[-a(t-b)]} to decide the value (j) of the 2nd sale time (t) (1502). Then the wasted time, i.e., the difference between the times (i) and (j) is calculated (1503). The actual verification time is added to the said wasted time (1504), and the result of this addition is registered in a total design verification data base of a row corresponding to a product to end the processing (1505).
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