1. A diagnosis assistance system comprising: an imaging unit which performs dynamic imaging for a subject and which generates a plurality of successive image frames; an analysis unit which extracts a subject region from each of the plurality of generated image frames, which divides the extracted subject region into a plurality of regions, and which analyzes the divided regions correlated among the plurality of image frames, thereby calculating a predetermined feature quantity indicating motions of the divided regions; an operation unit which allows a user to select a region serving as a display target of an analysis result by the analysis unit from among the divided regions; and a display unit which displays the feature quantity regarding the region selected by the operation unit, the feature quantity being calculated by the analysis unit.