A diagnosis support computer for diagnosing diseases in the dental field or system diseases using a panoramic image including a mandible region 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 is taken for each of a plurality of radiographic imaging conditions, and obtain a plurality of mandible model data from the panoramic radiographs; a contour model creation unit configured to extract a contour shape 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 the mandible model, the contour database storage unit constructing a 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; a 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; and an 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, wherein the model data acquisition unit receives the input of panoramic radiographs 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 radiographic imaging condition being a condition where imaging condition including at least one of an imaging position, an imaging posture of a provider of mandible model, an angle for taking an image, a rotation, a type of imaging apparatus, values of tube current and tube voltage, a density profile of image, and an image contrast being within preliminarily specified appropriate range, the inappropriate radiographic imaging condition being a condition where said imaging condition being not within preliminarily specified appropriate range, and obtain a plurality of mandible model data from the panoramic radiographs. a model data acquisition unit configured to receive an input of panoramic radiographs of a mandible region of a provider of mandible model, which is taken for each of a plurality of radiographic imaging conditions, and obtain a plurality of mandible model data from the panoramic radiographs; a contour model creation unit configured to extract a contour shape 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 the mandible model, the contour database storage unit constructing a 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; a 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; and an 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, wherein the model data acquisition unit receives the input of panoramic radiographs 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 radiographic imaging condition being a condition where imaging condition including at least one of an imaging position, an imaging posture of a provider of mandible model, an angle for taking an image, a rotation, a type of imaging apparatus, values of tube current and tube voltage, a density profile of image, and an image contrast being within preliminarily specified appropriate range, the inappropriate radiographic imaging condition being a condition where said imaging condition being not within preliminarily specified appropriate range, and obtain a plurality of mandible model data from the panoramic radiographs.