In collaborative learning, learners exchange opinions through communication. When learners study the same type of exercises after the collaborative learning, they recall that communication, find effective utterances, and derive an answer by themselves. Therefore, in an collaborative learning support environment, it is useful for learners to monitor communication history after the learning has been finished. In the collaborative learning of exercises that contain an answer and answering paths, grasping answering path that learners derive during the learning and detecting effective utterances based on their answering paths are important. In our approach, the function to add annotations to utterances during learning is introduced in order to grasp effective utterances that students think during the learning. Then, based on the added annotations, learning situation of other learners and effective utterances for learners are derived.
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