1. A diagnosis support computer comprising: a model data acquisition unit configured to receive an input of panoramic radiographs of a mandible region of a provider of mandible model, which are taken for each of a plurality of radiographic imaging conditions including an appropriate radiographic imaging condition and an inappropriate radiographic imaging condition, the appropriate/inappropriate radiographic imaging condition being determined by a position judgment unit and an image quality judgment unit, the appropriate radiographic imaging condition being a condition in which, when taking the panoramic image of a mandible region, positioning of a median line to the center of the face of the provider of mandible model and an image quality are adjusted, the panoramic image obtained has no skewing, deformation, and image quality error, the inappropriate radiographic imaging condition being either a condition in which the panoramic image is taken at an incorrect position where the position or the orientation of the mandible region and an imaging posture of the provider of mandible model are out of appropriate range or a condition in which the panoramic image is taken where ray dose is insufficient or too much or the image quality is inappropriate, and obtain a plurality of mandible model data from the panoramic radiographs; a contour model creation unit configured to extract a contour of the mandible from the obtained mandible model data to create contour model data; a contour database storage unit configured to store the created contour model data together with imaging information on an imaging position, an imaging posture, and an image quality, and provider information including an age, a gender, and a disease history of the provider of mandible model, the contour database storage unit constructing contour model database; a diagnosis image data receiving unit configured to receive an input of diagnosis image data, the diagnosis image data being obtained by taking a panoramic radiograph of a mandible region of an examinee who is a subject of diagnostic support; an edge extraction unit configured to extract edge data of the mandible from the received diagnosis image data; a similar model searching unit configured to collate the extracted edge data and a plurality of contour model data of the contour model database to search for the similar contour model data; the position judgment unit configured to judge an imaging position of the diagnosis image data and appropriateness of a position of an imaging posture based on the imaging information on the contour model data found by the similarity search; the image quality judgment unit configured to judge degree of appropriateness of image quality including a density profile and a contrast of the diagnosis image data based on the imaging information of the contour model data found by the similarity search; and a diagnosis support information provision unit configured to provide a disease with a risk of contraction as the diagnosis support information based on the provider information of the contour model data found by the similarity search, the diagnosis support information being provided with respect to the diagnosis image data judged to be taken under the appropriate imaging conditions by the position judgment unit and the image quality judgment unit.