In a design supporting system, projected shape information of a part, for example, solid model definition drawing is input from a shape inputting section based on the drawing formation on the CAD, shape attribute information thereof is input from a shape attribute inputting section, and the projected shape information and shape attribute information are combined and stored in an input information storing section. Further, a 3-dimensional CAD solid model creation command group includes a plurality of 3-dimensional CAD drawing modules used for converting the projected shape information into 3-dimensional information. A control section creates a 3-dimensional CAD solid model by controlling the 3-dimensional CAD drawing modules of the 3-dimensional CAD solid model according to the projected shape information and shape attribute information stored in the storage section.