A fabrication process for a trench Schottky diode with differential oxide thickness within the trenches includes forming a first nitride layer on a substrate surface and subsequently forming a plurality of trenches in the substrate including, possibly, a termination trench. Subsequently, the model transforming data generating portion 4 reads out pattern data corresponding to the specified road area from a pattern model storage portion 5 and generates model transforming data. An end surface of the flexible portion on the thin film portion side has a curved shape which is concave toward a connecting portion with the substrate. The deal structure is preferably set up so as to provide buyers with both price and non-price criteria information that the buyer’s would consider important in a purchase of the type of product being offered by the seller.