1. An electronic drawing generation apparatus that generates an electronic drawing given to an electromagnetic field simulator for analyzing an electric field and a magnetic field of a substrate where a circuit is formed based on the electronic drawing, the apparatus comprising: a shape determination section that determines a necessary part in the substrate, the necessary part needing to be subjected to simulation by the electromagnetic field simulator; a shape edit section that cuts out the necessary part determined by the shape determination section; and a storage storing a design rule database that includes design rules, wherein the shape determination section includes a design rule check section that determines a design-rule violating part as the necessary part, the design-rule violating part being a part violating the design rules.