隨著網際網路的蓬勃發展，資訊越來越多元化，許多使用者借由網路資訊去取得新技術資料及課程內容。透過搜尋引擎提供網頁目錄查詢服務，並幫助使用者在很短的時間對此技術包含那些相關之子技術有所了解，即便成了一個重要服務。
在此篇論文中，我們提出以超文字與關鍵字相關度的技術用來建構階層式主題搜尋，讓使用者迅速有效的熟知涵蓋主題範圍，有別於手動機制之建立。在我們的實驗分析結果，證明我們所提出的方法能有效搜尋相關階層式子技術，特別是那些主題無法經由手動機制建立的搜尋引擎得到服務，卻可以在本系統中得到較好之服務。因此有關階層式主題搜尋拓展研究的未來發展，仍然有許多問題在本篇論文中，如相關精確度與新主題搜尋問題尚需解決。
然而我們期望藉由階層式主題搜尋的推廣，讓每個人學習新技術將不再是困擾，此外也希望本篇論文中提到之問題可以繼續被研究下去。

As Internet booms prosperously, there is various information available for user to obtain, such as new technique information and course contents for instance. It has become an important task to provide "Topic Directory Query" Service in order to help users understanding relevant subtopics of their interested techniques within a short period of time.
In this thesis, we propose an approach that utilizes Anchor Text and Term-correlation technique to construct and generate topic hierarchy, in order to facilitate users search effectively and efficiently the scope of their interested topics that differs from manually constructed topic hierarchy, such as Open Directory Project or Yahoo Web Directory for instance. In our experiment analysis results, our proposed approach was proved to be effective in searching relevant hierarchical subtopics, especially those topics that cannot be found from manually constructed topic directory search engine mentioned previously but can be found in our system. Therefore, with regard to "Topic Directory Query" Service, there are still many issues need to be resolved, such as precision rate enhancement and new topic detection.
However, we still hope that learning new techniques for everyone will never be a troublesome problem. Furthermore, by promoting the concept of topic hierarchy generation, we hope the issues mentioned previously can be researched continuously.

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URL Lists:
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[51] NetNames Statistics. Available: http://www.netnames.com/
[52] Google. Available: http://www.google.com/
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[55] Alta Vista. Available: http://www.altavista.com
[56] Openfind. Available: http://www.openfind.com/
[57] Ask Jeeves. Available: http://www.ask.com/
[58] Vivisimo. Available: http://vivisimo.com/
[59] Overture. Available: http://www.content.overture.com/d/
[60] Teoma. Available: http://www.teoma.com/
[61] Mooter. Available: http://www.mooter.com/
[62] Yahoo. Available: http://www.yahoo.com/
[63] Yahoo Web Directory. Available: http://dir.yahoo.com/
[64] Open Directory Project. Available: http://dmoz.org
[65] Porter Stemming Algorithm. Available: http://www.tartarus.org/~martin/PorterStemmer/
[66] WebCrawler. Available: http://msxml.webcrawler.com/info.wbcrwl/search/web/mining
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