A simulation environment establishment unit constructs a three-dimensional virtual space for a simulation, where a plurality of lattice points is orthogonally arranged as well as ensures in a storage step a storage region storing information for each of the plurality of lattice points. A surface shape processing unit sequentially grows and changes a material surface shape in the three-dimensional virtual space in accordance with manufacturing process conditions, calculates a level value representing a distance from the material surface for each lattice point, and stores the level value into a storage region of a corresponding lattice point to represent the surface shape. A material inside information processing unit calculates material inside information within the material when the surface passes through a lattice point due to the growth and change in the material and stores the material inside information into a storage region of a corresponding lattice point.