PURPOSE: To resolve a question to be generated during viewing at real time by providing a question input device, a question extracting device to present question candidate information and to extract the real question based on input information, and an answering device to automatically retrieve and present answer information.

CONSTITUTION: A question input device 200 is provided to inquire a question Q generated for a viewer 105, and a question extracting device 300 is provided to extract real question information QR, which the viewer 105 desires to know, based on the input information. Further, an answering device 400 is provided to search an answer to the real question information QR by automatic retrieval. Answer information A are passed through a display controller 102 and outputted from a display device 104 and the viewer 105 can deepen comprehension by outputted answer display information QBA. Thus, when the questions are generated during the viewing of reproduced information, the question can be resolved at real time in that place.