PROBLEM TO BE SOLVED : To automatically execute processing, in consistency, relevant to a plurality of jurisdictions in real estate registration.SOLUTION : This information processing system is provided with a lot boundry data storing part for storing the lot boundary data of each lot included in a prescribed zone, a border line data storing part for storing the border line data of a region including the prescribed zone and the lot boundary data pertinent to the border line of the inside of the region and the assignment area data of the lot boundary, a lot border line prescribing means for prescribing the isolate lot boundary without configuring a pair by using data stored in the lot boundary data storing part, and for storing the lot boundary data in the storage device and an assignment data extracting means for extracting the assignment area data of the lot boundary stored in the storage device by using the data stored in the lot boundary data storing part, and for storing the lot boundary data in the lot boundary data storing part as the other side area identification data sharing the lot boundary. The area identification data are prestored so that when the subdivision of lot or jurisdiction is changed, processing for prescribing the lot boundary to be processed can be efficiently executed.COPYRIGHT : (C)2006, JPO&NCIPI