數位圖書館已成為資訊社會重要的資訊集散中心，也是資訊時代國家 總體力量的重要指標，其研究的急迫性不言而諭。數位圖書館之研究本質是科際 性的，如何由不同的觀點檢視原屬其他領域的研究是一項值得深入探討的課題。 本文藉由資訊組織與整理的觀點，說明現有數位圖書館資訊檢索子系統不足之 處，提出應使用權威控制子系統，以服務使用者、資訊檢索子系統以及詮釋資料 著錄子系統，同時討論該權威控制子系統的功能與規格，並以淡新檔案索引典為 案例，實作詞彙瀏覽、詞彙檢索、以及詞彙對映等三種功能。

　　　　　The digital library has become the important center of information collection and dissemination in the information society. It is also the important indicator of country power in the information era. Since the nature of DL researches is interdisciplinary, how to investigate the various researches of DL from different viewpoints is a critical issue. This paper argues the inadequacy of current information retrieval researches from the viewpoint of information organization, proposes an authority-control subsystem (dubbed Thesaulogy) to serve users, IR subsystems and metadata subsystems in DL, and discusses the functionality and specification of Thesaulogy. Finally, this paper reports the implementation of three functions of Thesaulogy, i.e., browsing vocabularies, retrieving vocabularies, and mapping vocabularies in terms of Dan-shin Archive thesaurus.