The rapid expansion of the Internet accompanies a serious side ef-fect. Since there are too many information providers, it is very difficult to ob-tain the contents best fitting to customers’ needs. Web Syndication Services (WSS) are emerging as solutions to the information flooding problem. How-ever, even with its practical importance, WSS has not been much studied yet. In this paper, we propose the Content Aggregation Middleware (CAM). It pro-vides a WSS with a content gathering substratum effective in gathering and processing data from many different source sites. Using the CAM, WSS pro-vider can build up a new service without involving the details of complicated content aggregation procedures, and thus concentrate on developing the service logic. We describe the design, implementation, and performance of the CAM.