RETRIEVAL SYSTEM WITH RETRIEVAL NAVIGATION FUNCTION

PROBLEM TO BE SOLVED: To efficiently retrieve the object of retrieval, which is classified by a registered keyword being a control word and is made into an electronic file. SOLUTION: When a retrieval object data base 3 is retrieved by a registered keyword but the object of retrieval does not exist in the data base 3 and when a retrieval result is obtained by retrieving the data base 3 with an another registered keyword, the combination of the retrieval keywords is preserved in a registered keyword conversion log 4 as a registered keyword change pattern. The association degree of the registered keywords in the respective registered keyword change patterns of the conversion log 4 is calculated and it is registered in a registered keyword conversion dictionary 6. A registered keyword group which is combined with the retrieval keyword which a retrieval person designates is prevented to the retrieval person as a similar registered keyword list.