SEARCH SYSTEM, SEARCH METHOD, SEARCH PROGRAM AND STORAGE MEDIUM

摘要

Provided is a search system which stabilizes the number of output search results while preventing a response time from increasing. A search condition acquisition section (24) acquires search conditions associated with a plurality of elements having a hierarchical structure. A search processing execution section (30) executes search processing for identifying, as search results, pieces of search target data associated with respectively corresponding elements in all the tiers that correspond to the elements included in the search condition. An information output section (22) outputs search result information under the condition that the number of pieces of identified search target data is equal to or larger than a predetermined number N. Under the condition that the number of pieces of identified search target data is not equal to or larger than the predetermined number N, the search processing execution section (30) executes the search processing on elements in all the tiers associated with the search condition changed so as to cancel the association with the element in a lowermost tier.