As use of internet gets increased, the efficiency of applying the chart which is expressing and providing information through web is increased. The chart has the high delivering ability of information because it expresses data visually. But there are problems such as compatibility between the chart composing programs, difficulty of sharing the chart data, and displaying the chart on the web. In this paper, we propose the chart markup language, which expresses the chart information by using the XML in order to solve problems of compatibility of the chart expression and sharing the chart information. The CML is possible not only to provide compatibility between platforms and programs but also to share the chart data as it is based on the XML.