1. An analytical model creation system for creating a desired analytical model by adding a given shape change to an existing analytical model, the system comprising an adjacent partial analytical model interlocking section for performing an interlocking change process, wherein the interlocking change process is performed on the existing analytical model as a combined analytical model containing a plurality of partial analytical models, by selecting any one of the partial analytical models in the combined analytical model to be a change-targeted partial analytical model, allowing a partial analytical model adjacent to the change-targeted partial analytical model to reflect a shape change made to the change-targeted partial analytical model, and thereby making a shape change to the adjacent partial analytical model in interlock with the shape change.