The present invention provides a method, which infiltrates super-heated material between preheated powder particles and therefore minimizes heat deformation and increases measurement accuracy. A rapid prototyping apparatus in accordance with the present invention comprises powder material spreading means 10, dispensing infiltration material means 20, laser beam scanning means 30, and control means. The powder material spreading means spread out powders 61 on the surface of platform 52 uniformly while moving along the X axis. The powders are the main material of desired products. The dispensing infiltration material means dispense infiltration materials 63 while moving along three axes and the super-heated infiltration materials 64 by laser beam 43 are infiltrated between the powders selectively. The laser beam scanning means preheat the powders by laser beam 42 within the melting point of the powders and super-heat the infiltration material by laser beam 43. The control means control the powder material spreading means, the dispensing infiltration material means, and the laser beam scanning means on the basis of modeling data of the desired products.