For the development of new products and/or business models, innovations by lead users who have strong needs and knowledge of the product have attracted attention and success stories have been reported. On the other hand, crowdsourcing, which has spread widely with the development of the Internet, can collect ideas for new products from a wide range of ordinary users. This study investigates the interaction between ordinary users' and experts' ideas through the experiments. We found that when the experts refer to the ordinary user's novel idea as an example, the novelty of the conceived idea increased and the feasibility of the idea decreased. On the other hand, when ordinary users are exposed to experts' concept, the novelty decreased and the feasibility increased. This provides novel and practical suggestions for effectively collecting and utilizing the creativity of ordinary users for innovative product development by controlling the degree to which they share information with each other.

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