To provide a three-dimensional image display system and a model data construction method, which are applied to a house design simulation system, etc., are easier to use and can contribute development of a related industry, at a low cost.

A stereoscopic sketch is easily restored even in the case of a 'data file' formed by intentionally lacking 'parts data', namely, only 'constitutional data' to mean 'dimension and assembly arrangement, etc., of the respective part.' by attaching the respective addresses to mean storage places to the 'parts (object) data', integrating them in a 'shared database' under management of a 'parts management server' and making them freely searchable from anywhere of a 'client terminal' connected with them by a network at every using time.