An information service system includes a contents service provider for providing contents data of a content together with an application software for providing an informational service intended by the content, a service center for collecting the contents data and the application software provided by the contents service provider, and terminals of plural kinds coupled with the service center through communication. The service center includes an information service control means for providing the informational service suitable for the kind of the terminal by executing the application software collected from the contents service provider, and the terminal uses the informational service provided by the service center.