1. A three-dimensional model data generation device that generates three-dimensional model data for making a three-dimensional model of an object which includes a plurality of structural elements from three-dimensional image data representing a three-dimensional image of the object, the device comprising: a pattern adding unit for adding a textured pattern to at least one of a surface of the object represented by surface data of the object and surfaces of the structural elements represented by surface data of the structural elements generated from the three-dimensional image data; and a data generation unit for generating the three-dimensional model data by combining the surface data of the object and the surface data of the structural elements including the surface data to which the textured pattern is added.