1. A method of supporting an optimum wiring design of a linear structure, comprising: providing a finite element model which corresponds to both of the linear structure and a support member which supports the linear structure, the finite element model being formed as an elastic body having a plurality of combined beam elements which retain linearity; setting physical properties and restriction conditions of the linear structure and the support member to the finite element model; calculating a predictive shape of the finite element model which is in a physically balanced condition based on the physical properties and the restriction conditions; and outputting a calculation result of the calculation process.