DATABASE COMPLEMENTATION SYSTEM, DATABASE COMPLEMENTATION METHOD, DATA COMPLEMENTATION SERVER, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To complement deficit values in a possessed database while keeping secret mutually possessed information on users which may be privacy information.SOLUTION: Statistical information generation means of an information providing server generates, as statistical information, the total of differences in value between each pair of items and the number of samples when the total is calculated with respect to pairs of all items on a first axis in a possessed database. Statistical information transmission means transmits the generated statistical information to a database complementing server. Statistical information reception means of the database complementing server receives the statistical information. Complementing means complements deficit values in the possessed database using the received statistical information.