15. The search result ranking device as described in claim 11 , wherein the objects subjected to user actions are objects that were selected from among the search results.
17. The search result ranking device as described in claim 15 , wherein the at least one processor is further configured to: classify objects selected from among the search results with the selected set, wherein the adjusting of the rank of objects that are to be displayed or to be ranked and whose attribute characteristics comply with the reference norms comprises: calculate a commonality level of each attribute characteristic in the selected set based on the user action information on the objects in the selected set; rank various attribute characteristics in the selected set and unselected set in order of highest to lowest commonality level; select a pre-established quantity of top-ranked attribute characteristics to serve as reference norms; and raise the rank of objects that are to be displayed or to be ranked and whose attribute characteristics comply with the reference norms.