1. A diagnostic imaging support system comprising: storage means for storing an image of a subject; and control means for reading out the image from storage means, extracting a diagnostic region including a bone region from the read image on a basis of a characteristic quantity previously set, extracting a bone portion component and a component other than the bone portion from the diagnostic region, and calculating structure analysis information of the bone by utilizing at least one of a run length or density of a region that corresponds to the component other than the bone portion.