A system and a method for continually searching a region with the excessiveness price change by using the space cluster pattern and space relation are provided to classify excessive cost change region by using space pattern data. A candidate generation part(200) receives space distribution data of the real estate price change of the reference viewpoint comparison price change deviation. The candidate generation part produces a plurality of candidates which is all spatial extents. A space cluster analysis part(310) analyzes whether it is the space cluster pattern of the excessiveness price change concentration region in which the possibility that a plurality of candidates develops into the competition overheating region is high. A space relation determining unit(320) determines whether the discrete real estate of the candidate analyzed into the space cluster pattern has the space relation.