Current forms of web browsers do not adequately reflect the current situation of explosive increase of web space. The user is still forced to access the web space page by page. In this paper we propose a web browsing method based on communities. A community is a collection of web sites which are related each other. Unlike the conventional page-oriented search engines/browsers, the proposed interactive visualization system enables the user to see not only the related web sites but also communities in exploring the ever growing web space. This helps him/her to grasp an overall structure of the target space. Results of a user test shows that the system is powerful and useful.