1. A design support system comprising: an input portion that receives shape data indicative of at least two, mutually different shapes, finite element model data indicative of a finite element model for each of said at least two shapes, and attribute data indicative of an attribute at each node of the finite element model; a shape display portion that displays said at least two shapes on a screen; a superimposing portion that superimposes said at least two shapes displayed on the screen by the shape display portion, on each other, with reference to a site designated by information received by the superimposing portion, or a predetermined site; an attribute calculating portion that calculates the attribute at an attribute calculation point set at a predetermined position on the screen, based on the attribute of said each node, with respect to each of said at least two shapes superimposed on each other; and an attribute difference calculating portion that calculates differences in the attribute between said at least two shapes, at the nodes and the attribute calculation points, wherein the attribute calculation points are separate from the nodes of the finite element model.