This paper proposes a spoken dialogue system that can deliver information effectively using utterance plans created prior to conversation. The effectiveness is achieved with the system's ability to present the core content and further provide the details upon user's responses. To enable this interactive capability, the system generates two kinds of plans in advance: the primary plan for delivering the core content of an article, and the subsidiary plans that organize detailed information that could answer user's possible inquiries. This paper presents how the system makes the plans, and discusses the effectiveness by showing the example dialogue between the system and a user.
