1. A system for a mosaic rendering of a 3D (three-dimensional) model, comprising: an input module configured to input a 3D model; a texture creating module configured to create textures using polygon information on the inputted 3D model; a mapping module configured to perform one-to-one mapping of the created textures onto respective polygons of the 3D model, using a geometric structure of the inputted 3D model, wherein the mapping module expresses a three-dimensional effect on the 3D model by varying lengths of first normal vectors at a first portion where the textures overlap with each other; and a rendering module configured to render a mapped mosaic image.