The present invention relates to a real estate big data analysis method collecting and analyzing real estate legal relationship information online by a real estate big data analyzer. The real estate big data analysis method comprises the steps of : grouping two or more real estates for real estate right alteration information extraction and storing information for extracting real estate legal relationship information of the grouped real estates; accessing to online site providing real estate legal relationship information after the date when right alteration monitoring begins and inquiring states of processing registration application for all grouped real estates; crawling the real estate legal relationship information for the grouped real estates from a result of inquiry of the states; and storing real estate legal relationship information newly generated from the grouped real estates as real estate right alteration information.(S1100) Group a plurality of real estates(S1150) Set a reference date of monitoring(S1200) Access and search an online site(S1300) Crawl real estate right relationship information(S1400) Is new information generated?(S1500) Generate information of real estate right change(S1600) Risk grade?(S1700) Differential warningCOPYRIGHT KIPO 2019