It is possible to reproduce the color of the original tooth as the color of a dental prosthesis. Color data on the tooth obtained by imaging it before treatment is stored in an information processor. When the dental prosthesis produced to treat is colored, the stored color data on the tooth before the treatment is transmitted from the information processor to a printer, and the printer prints color corresponding to the color data directly or indirectly on the dental prosthesis. As the indirect printing by the printer, the color corresponding to the color data is printed on a predetermined transfer paper, and the printed transfer paper is pasted to the dental prosthesis.
