METHOD AND SYSTEM FOR INSTANTLY EXPANDING A KEYTERM AND COMPUTER READABLE AND WRITABLE RECORDING MEDIUM FOR STORING PROGRAM FOR INSTANTLY EXPANDING KEYTERM

A method for instantly expanding a keyterm is provided. According to the query term, a data search process is performed by several search engines. Several document snippets related to the query term are obtained from the search engines. A related term table containing several keyterms corresponding to each snippet is built up by analyzing each of the document snippet. According to a position relationship between the each keyterm and the query term in each snippet, a correlation calculation is performed for giving each keyterm a correlation value. A semantic merging process is performed to merge the correlation values of the keyterms with the same semantic meaning to be a correlation indicator. Some of the keyterms are determined to form a keyterm set of the query term.