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World-Wide-Web is a huge pool of valuable information for companies to know what their competitors are doing and what products and services they offer up-to-date. Companies can gather business intelligence from the Web for planning countermeasures strategies. Hence it is crucial to have the right tool to effectively gather such information from the Web. Many information retrieval and monitoring technologies have been developed. But they are more for generally tracking changes and downloading the whole websites for offline browsing. This paper is to shed some light on specifically the design of a Web monitoring system for gathering business information relevant to a company. The Watcher Agent is a server-based system that is built with two main parts, namely Price Watcher and Market Watcher. The system will assist company users in price information collection, news information filtering, and product ranking estimation, thus saving time and effort for them.