1. A storage medium for use in a three-dimensional map display device in which a three-dimensional configuration of a given part on two-dimensional map data is classified in advance into a plurality of patterns and a transformable three-dimensional map display model is prepared in advance for each of the patterns, and the three-dimensional map display model is transformed into a desired form to generate and display three-dimensional image data of the given part, said storage medium comprising: model transforming data operable to transform the three-dimensional map display model into the desired form in correspondence with the given part to be three-dimensionally displayed.