SEARCH SYSTEM AND PROGRAM

PROBLEM TO BE SOLVED: To improve a search speed and a hit ratio in a search system searching a database based on a query character string and outputting a search result acquired from the database. SOLUTION: This search system is provided with a data cache storage part 32 storing a plurality of search results to the query character string as a query log while updating it and allowing accessing at a speed higher than that for a natural language database 23, a query execution part 31 searching the query log stored in the data cache storage part 21 prior to the DB 23 and acquiring a search result, a query log storage part 35 storing a plurality of search results to the previously prepared query character strings as a query log in a non-volatile format, and a query analysis part 34 transferring a plurality of query logs stored in the query log storage part 35 to the data cache storage part 32 for storing and setting them. COPYRIGHT: (C)2006,JPO&NCIPI