1. A design support apparatus comprising: a shape determination unit configured to determine a shape of a ridge line that is provided in a plane surface included in a three-dimensional model of a verification target and forms an entrance of a hole or a base of a projection in the plane surface; an extraction unit configured to extract, from within the three-dimensional model, a graphic that includes a ridge line coinciding with at least a portion of the shape of the ridge line determined by the shape determination unit; a creation unit configured to create a comparison-use vector to be compared with the direction of a normal vector of the plane surface, in response to the type of the extracted graphic; and a determination unit configured to determine whether the graphic extracted by the extraction unit is a graphic forming a hole or a graphic forming a projection, in response to an angle between the normal vector and the comparison-use vector.