| 摘要 |
a) Predicting, by conversation information, context patterns that can possibly occur in future, evaluating the predicted context patterns according to the rating criteria, b) selecting a system message which is to be output next among a highly evaluated context pattern, and outputting the system message, c) selecting at least one user message that is among the user messages correspond to the system message and that is included in the conversation information, and outputing the user message, d) accepting selection of any one of the user message, e) deciding the next position of a marker that shows current topic according to the selected user message, f) repeating the step a) to e).
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