Disclosed is a method and system for managing web sites registered in a search engine that provides information about web sites on the Internet, wherein information about the web sites registered in the search engine is analyzed to prevent the provision of search results different from essential contents contained in the web sites. In the method, information of the registered web site is received and recorded in a database after being classified by predetermined fields. A search robot is controlled to read a source file constituting a web page of the registered web site, and the read source file is then analyzed. It is determined based on a predetermined basis whether or not the registered web site is a deceptive site. Predetermined processing is performed on the registered web site if the web site is determined to be a deceptive site. The source file is preferably an HTML document.