In the dynamic and competitive market, enterprises have to timely launch new as well as creative products and services to fulfill the consumers’ demands for occupying much more market share. Therefore, they all regard innovation as their strategic slogan. This paper presents a novel Web-based innovation support system (ISS) named iChance for collaborative innovation, such as idea generation and knowledge creation, based on Idea Discovery Model (IDM). iChance includes four main functional modules: (1) scenario-based innovation module, (2) requirement module, (3) communication module, and (4) toolbar module. The whole operating procedure of iChance is in accordance with one version of Innovators’ Market Game (IMG) which was invented by Ohsawa as a tool for aiding humans’ innovative thoughts and communication. Finally, case studies demonstrate all the principles of IMG are well realized in iChance system when applied in the early phase of product or service development.