Abstract: An image display system 1 in accordance with the present invention is configured with a navigation device 2 and an image display device 4 which are connected to each other via a network 3. The navigation device 2 transmits a drawing setting for specifying a method of drawing a vertex string showing a feature of a component of an image when a network connection with the image display device 4 is established, and transmits image data including the vertex string when the image display device draws an image, and the image display device receives the drawing setting from the image transmission device, corrects the drawing setting on the basis of the display ability of the image transmission device and its own display ability, and, when receiving the image data from the image transmission device, draws and display the image by using the above-mentioned drawing setting corrected thereby.

Abstract: Included are a table creating unit that creates, for a three-dimensional CAD model, tabular data that describes change logic for each changed state, the change logic associating a changed state with a condition to be satisfied to shift to the changed state, the changed state being a form after transformation of the three-dimensional CAD model; a data converting unit that converts each change logic set in the created tabular data into a description in a certain program language, and creates a model built-in program; an model built-in program IO unit that registers the converted model built-in program to the three-dimensional CAD model; and a three-dimensional CAD software-program unit that transforms the three-dimensional CAD model when receiving an operation for transforming the three-dimensional CAD model, based on the operation and a change logic described in a model built-in program registered to the three-dimensional CAD model.