A computer-implemented method of predicting, by utilizing a finite element method, a shape of a wiring structure in which the wiring structure comprises a wire member covered by an exterior member, said wiring structure being regarded as an elastic body in which a plurality of linear beam elements are coupled with each other, the method comprising: a drawing step of drawing the wiring structure having an arbitrary shape by a manual operation; a shape characteristic extracting step of extracting shape characteristic from the drawn wiring structure; a constraining condition extracting step of extracting constraining condition from the drawn wiring structure; a material characteristic calculating step of calculating material characteristic of the drawn wiring structure based on the drawn wiring structure; and a predicted shape calculating step of calculating a predicted shape which is brought into a physical equilibrium state by applying the shape characteristic, the constraining condition and the material characteristic to the finite element method, said method characterised by further comprising an alarm outputting step of outputting an alarm when it is determined that the predicted shape, which is intended to be brought into the physical equilibrium state by the predicted shape calculating step, cannot be calculated for the wiring structure drawn according to the manual operation wherein a characteristic table representing relationships among type, thickness and material characteristic of the exterior member is previously stored, wherein the material characteristic calculating step calculates the material characteristic of the drawn wiring structure using the type and thickness of the exterior member calculated based on the drawn wire structure in the characteristic table, and wherein in the characteristic table, longitudinal modulus of elasticity or transverse modulus of elasticity of the exterior member is treated as the material characteristic of the exterior member. a drawing step of drawing the wiring structure having an arbitrary shape by a manual operation; a shape characteristic extracting step of extracting shape characteristic from the drawn wiring structure; a constraining condition extracting step of extracting constraining condition from the drawn wiring structure; a material characteristic calculating step of calculating material characteristic of the drawn wiring structure based on the drawn wiring structure; and a predicted shape calculating step of calculating a predicted shape which is brought into a physical equilibrium state by applying the shape characteristic, the constraining condition and the material characteristic to the finite element method, said method characterised by further comprising an alarm outputting step of outputting an alarm when it is determined that the predicted shape, which is intended to be brought into the physical equilibrium state by the predicted shape calculating step, cannot be calculated for the wiring structure drawn according to the manual operation wherein a characteristic table representing relationships among type, thickness and material characteristic of the exterior member is previously stored, wherein the material characteristic calculating step calculates the material characteristic of the drawn wiring structure using the type and thickness of the exterior member calculated based on the drawn wire structure in the characteristic table, and wherein in the characteristic table, longitudinal modulus of elasticity or transverse modulus of elasticity of the exterior member is treated as the material characteristic of the exterior member.