A data search system is configured to: generate a first data set including a plurality of records, in which a first column is used as a reference column, and clustering is performed for each predetermined range of the first column to generate first clusters; generate a second data set including the plurality of records, in which a second column is used as the reference column, and clustering is performed for each predetermined range of the second column to generate second clusters; cause a memory device to store therein the first date set and the second data set; generate index information in which information indicating the reference column, information indicating the predetermined range, and a memory area of the clusters are associated with each other; read out the cluster from the memory device based on the index information; and extract data matching the search condition from the read cluster.