document: CWS : a comparative web search system In this paper , we define and study a novel search problem : Comparative Web Search ( CWS ) . The task of CWS is to seek relevant and comparative information from the Web to help users conduct comparisons among a set of topics . A system called CWS is developed to effectively facilitate Web users ' comparison needs . Given a set of queries , which represent the topics that a user wants to compare , the system is characterized by : ( 1 ) automatic retrieval and ranking of Web pages by incorporating both their relevance to the queries and the comparative contents they contain ; ( 2 ) automatic clustering of the comparative contents into semantically meaningful themes ; ( 3 ) extraction of representative keyphrases to summarize the commonness and differences of the comparative contents in each theme . We developed a novel interface which supports two types of view modes : a pair-view which displays the result in the page level , and a cluster-view which organizes the comparative pages into the themes and displays the extracted phrases to facilitate users ' comparison . Experiment results show the CWS system is effective and efficient .
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