Abstract: A method of designing a dental prosthesis model, such as a bridge or a crown. The method includes measuring a three-dimensional configuration of a dentition of a subject in order to obtain configuration data of upper and lower jaw dentitions of a subject. The dentition configuration data is stored. Also stored is pontic model data defining standard pontic model configurations corresponding to the configurations of individual teeth. The pontic model is expressed as a combination of patches that are stored as configuration expression data, and morphology definition data indicating a characteristic morphology of the teeth of the pontic model. The pontic model data is read out, corresponding to a tooth or teeth where the dental prosthesis is to be placed. Based on the read-out pontic model data, crown model data indicating a crown region is made. The crown model data is displayed so that it can be superimposed on a dentition configuration diagram.