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１引言目前流行全球的因特同热有很大一部分是由于ＷＷＷ的盛行引起的，ＷＷＷ的实现使得基于字符方式的Ｉｎｔｅｒｎｅｔ信息交流方式进入了图形和多媒体时代。最初Ｗｅｂ上的信息是静止的，信息内容只有在站点管理人员的更新后才发生变比，用户能获取的信息由信息提供者决定
1 INTRODUCTION At present, a great part of the Internet-related heat in the world is caused by the prevalence of the WWW. The realization of the WWW has enabled the Internet-based exchange of character information to enter the era of graphics and multimedia. Initially, the information on the Web is static. The information content is only changed after the site administrator updates. The information that the user can obtain is determined by the information provider