A diagnosis support system 1 includes a diagnosis support computer 3. The diagnosis support computer 3 includes a model data acquisition unit 14 configured to obtain a plurality of mandible model data 9, a contour model creation unit 16 configured to create contour model data 15 from the mandible model data, a contour database storage unit 20 configured to construct a contour model database 19 from the contour model data 15 or similar data, a diagnosis image data receiving unit 21 configured to receive an input of diagnosis image data 6 of an examinee, an edge extraction unit 23 configured to extract edge data 22 from the diagnosis image data 6, a similar model searching unit 24 configured to search contour model data 15 based on the edge data 22, a position judgment unit 25 and an image quality judgment unit 26 configured to judge an imaging position or similar condition and an image quality based on imaging information 17, respectively, and a diagnosis support information provision unit 27 configured to provide diagnosis support information 7 based on provider information 18.
