Abstract: According to one embodiment, a design method for designing a product including a plurality of general-purpose components and a plurality of non-general-purpose components, the design method includes the steps of: (a) obtaining from a storage device the plurality of general-purpose components having color information substituted for a plurality of first attribute information of each of the plurality of general-purpose components; (b) arranging the plurality of general-purpose components on a three-dimensional CAD screen, and arranging the plurality of non-general-purpose components on the three-dimensional CAD screen; and (c) assembling each of the arranged plurality of general-purpose components and each of the plurality of the non-general-purpose components into the product on the three-dimensional CAD screen, and substituting the color information for each of a plurality of second attribute information contained in any of the plurality of the non-general-purpose components.