POLARITY ESTIMATION SYSTEM, INFORMATION DELIVERY SYSTEM, POLARITY ESTIMATION METHOD, POLARITY ESTIMATION PROGRAM AND EVALUATION POLARITY ESTIMATIOM PROGRAM

摘要

An evaluation polarity of reputation information with an unknown evaluation polarity is estimated by utilizing reputation information with a known evaluation polarity. The present polarity estimation system is a polarity estimation system for estimating an evaluation polarity indicating whether reputation information is positive or negative, and includes a reputation information storage part that precedently stores reputation information with a known evaluation polarity; and a polarity estimating means for estimating an evaluation polarity of reputation information with an unknown evaluation polarity on the basis of the reputation information with the known evaluation polarity precedently stored in the reputation information storage part.