1. A computer-implemented biodata model preparation method of preparing a dynamic 3D data model of a live body from CT (computed tomography) images of the live body and MRI (magnetic resonance imaging) images of the live body, the biodata model preparation method comprising generating CT/MRI images of the live body with pixels having CT values and MRI values by correcting distortion of the MRI images from the CT images and laying the corrected MRI image over the CT images, generating 3D data where 3D regions of organs targeted for modeling are identified by determining 3D regions corresponding to organs targeted for modeling in the CT/MRI images, converting CT values and/or MRI values of pixels in the 3D regions in the 3D data to physical values, and generating a dynamic 3D data model of the live body expressed by a set of tetrahedron elements from the 3D data having the physical values.