The authors created a Web-based collaborative learning system, which supported question-posing by learners, assessment from peers, and communications with question-posers and peers. They applied it to an actual university course. As the results, they identified some features to be enhanced, i.e., communication support, solution to a problem with respect to quality of posed questions, and motivation improvement. This paper describes a learning community support system based on question-posing called Concerto II to solve the problems.