1. A computer-implemented analytical model creation system configured to create a desired analytical model by effecting a shape change to a combined analytical model containing a plurality of partial analytical models, the system comprising: a computer, including data processing hardware and storage hardware; a combined analytical model implemented in the computer, and having a plurality of partial analytical models; an interlocking change unit implemented in the computer, and configured to: select a partial analytical model in the combined analytical model as a change-targeted partial analytical model, modify the change-targeted partial analytical model, thereby generating a changed partial analytical model, select an adjacent partial analytical model disposed adjacent to, and interlocking with, the change-targeted partial analytical model, acquire adjacency information pertaining to a relationship between the change-targeted partial analytical model and the adjacent partial analytical model; acquire information pertaining to an adjacency relationship between the changed partial analytical model and the adjacent partial analytical model; and modify the adjacent partial analytical model so as to compensate for modifications made to the change-targeted partial analytical model, by effecting at least one of the following, based on the acquired adjacency information: moving a node for a mesh in the adjacent partial analytical model, deleting a mesh from the adjacent partial analytical model, and adding a mesh to the adjacent partial analytical model, thereby generating a modified adjacent partial analytical model that interlocks with the changed partial analytical model.