Numerical analysis mesh generating method and apparatus

The triangular mesh generating portion (104) divides the surface of geometry model to be meshed in a meshed manner according to a target element dimension and generates a triangular mesh on the surface of geometry model. The regular mesh generating portion (105) assumes a shaped parallelepiped enclosing the shape to be meshed. The parallelepiped is divided in a meshed manner by the hexahedral element whose distance between the nodes has the substantially same density as the triangular mesh on the surface. The resulting regular mesh located inside the triangular mesh on the surface of geometry model is divided into a tetrahedral meshed manner. The shell meshing area extracting portion (106) extracts a shell-like space between the inner tetrahedral mesh and the triangular mesh on the surface of geometry model. The shell mesh generating portion (107) generates the tetrahedral mesh in the overall shape to be meshed.