The invention discloses a stop word mining method. The stop word mining method comprises the following steps that a
query log is obtained; the inverse document frequency of
search terms in a search string recorded in the
query log, the relative term weights of the
search terms, search term sets generated due to search string modifying behaviors, and at least one kind of attribute information in the corresponding relation set, generated due to trigger behaviors, between the search string and a
web page URL are obtained, and a stop word set is generated according to the attribute information. In addition, the invention provides a stop word mining device, a searching method and device, and an evaluating method and device for a stop word mining
algorithm. By the adoption of the stop word mining method and device, the accuracy rate of mined stop words is increased; according to the searching method and device, due to the fact that an original search string is simplified by removing stop words, more relevant web pages can be found out, and the accuracy rate of searching is increased; according to the evaluating method and device for the stop word mining
algorithm, evaluation is conducted in a
cross validation manner, and an optimal
algorithm can be obtained through comparison.