The search method includes: receiving a search request including plural search conditions; separating the plural search conditions into search conditions for individual databases; storing, for each database, the search condition and the database identifier in a condition record; searching a search result management table by the database identifier and the search condition; determining anterior search databases; searching each of the anterior search databases by the search condition to acquire a first search result; determining common entity identifiers included in common in the first search results; and searching each of posterior search databases by the common entity identifiers and the search condition.