To provide a dental diagnostic system capable of performing advanced diagnosis regardless of the degree of experience.

The dental diagnostic system includes 3D image information input means 20 for inputting a 3D image information including at least a part of an upper jaw or a lower jaw obtained by an examination utilizing scanning line, recognition means 30 for recognizing the shape/position of the inner surface of an oral cavity, positioning means 40 for positioning both based on the shape/position recognized by the recognition means 30 and the 3D image information, and output means 50 for outputting all or a part of the positioned 3D image information to a retina operation display 80.