6. The information retrieval system of claim 1 , wherein the display displays values which identify the relevance of a document to levels in the selected hierarchies, in accordance with information provided by the search engine that is based upon analysis of the document among the located documents to determine which of the terms in a hierarchy said document most closely relates to.
6. The information retrieval system of claim 1 , wherein the display displays values which identify the relevance of a document to levels in the selected hierarchies, in accordance with information provided by the search engine that is based upon analysis of the document among the located documents to determine which of the terms in a hierarchy said document most closely relates to. 7. The information retrieval system of claim 6 , wherein the user interface automatically selects a level within the hierarchy in accordance with the analysis of a selected document.