1. A diagnostic imaging support system comprising: input means for setting a characteristic quantity for performing a predetermined threshold processing for a bone region in an image of a subject; control means for reading out the image from storage means which stores the image of the subject, extracting a diagnostic region including the bone region from the read image on the basis of the characteristic quantity set by the input means, and calculating, for the extracted diagnostic region, structure analysis information of the bone by use of component identification information representing a bone portion component and a component other than the bone portion; and display means for displaying the calculated structure analysis information of the bone while relating it to the image of the subject.