Abstract: In an aspect of the present invention, a resistance net generating apparatus includes a dividing section configured to acquire a data of a wiring pattern which contains connection position with vias and to divide the wiring pattern into rectangular patterns; a division pattern processing section configured to set nodes and resistances base on the rectangular patterns; and an output section configured to output positions of the nodes and the resistances as a resistance net specifying data. The wiring pattern is represented by sidelines extending into an X direction and a Y direction orthogonal to the X direction. The dividing section divides the wiring pattern into the rectangular patterns by extension lines extending from the sidelines into an inside of the wiring pattern.