In a cooperative processing system for performing cooperative process between a portable terminal and a television terminal through a service server and a device control server, content and content information separately managed by a content server connected to the television terminal and the service server are searched based on a search condition extracted from the content or the content information reproduced and displayed by the portable terminal, and the search result of the content and the content information is seamlessly displayed on the television terminal. Consequently, the convenience of the user in content usage can be enhanced.