This paper proposes an interactive visualization system that supports tasks of monitoring multiple BBS threads regularly. A BBS is useful as means to know the latest information and wide range of opinions about the topics of interest. However, we must spend much time on reading large number of posts in a thread to recognize topics discussed in it. In addition, it is so difficult to read mu f f ltiple threads simultaneously that we may miss valuable information. The proposed monitoring system

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... olves these problems by keyword-based visualization. Furthermore, this system realizes flexible monitoring refle f f cting user's interest by keyword tracking function for confirming the latest topics about specified keywords. This paper analyzes the behaviors of test participants using the prototype system based on eye-tracking data.