Provided in the present invention is a repetitive fusion search method for a search system, in which: a search interface 20 displays parameter numerical value setting fields 25 for setting a numerical value for each of multiple instinct based feature parameters in order to input instinct based rating information, and a text input field 24 and a keyword selection field 26 for inputting keywords; and a search engine 13 searches, in response to search inputs input by a searcher using the search interface, a search target database 11 based on the keywords and extracts relevant targets, determines priority for the relevant targets based on the instinct based rating information, and transmits the relevant targets to the search interface 20.