According to an aspect of the present invention, a method for refining real estate information includes the steps of : confirming an area, a landmark, a city district, and a use area of analysis target real estate in actual land market price information; searching for real estate whose area, landmark, city district, and use area on individual land property information are all identical to those of the analysis target real estate; and detecting an address of the real estate which is all identical to an address of the analysis target real estate. Accordingly, the present invention can generate transaction details and actual market prices for each address and provide the transaction details and actual market prices for each address to users.(AA) Start(B1, B2) No(C1, C2) Yes(DD) End(S101) Select an analysis target transaction in real land transaction price information of the Ministry of Land(S102) Is there individual land characteristic information in the same year with the analysis target transaction?(S103) Is there previous year or following year information?(S104) Select individual land characteristic information in the corresponding year(S110) Check size, land category, city/province/district, and use area of a real estate to be analyzed in the real land transaction price information(S199) Classify it as undefined dataCOPYRIGHT KIPO 2018