The population of consumers who purchase goods through electronic commerce(EC) is increasing due In the advance of Internet. They can purchase goods freely without time and space restriction and can have variety of choices of goods. Now most of e-Catalogs rely on the simple texts or images to present information on goods. As such, there is limitation in describing goods in detail, which might not make consumers interested in those goods. To solve the problem, more advanced e-Catalogs are demanded compared with the existing ones, requiring research on the e-Catalog authoring techniques that utilize dynamic multimedia data such as audios or videos in addition to the conventional texts and images. In this paper, we describe development of an e-Catalog authoring tnol that is based on SMIL(Synchronized Multimedia Integration Language) which is one of XML applications.