Due to the inferior condition of local library reference service, an air of indifference about users, and the increase in Internet resources, cooperative reference service in domestic libraries tend to be stagnant. The increase in Internet resources was reconsidered, aside from traditional library reference service, based on question and answer service. It shed new light on the importance of indirect service, which is focused on reliable knowledge base construction. This study analyzed cooperative reference service, which is managed by the Japanese Diet library that pursued indirect service contrary to ours. Based on that, it suggested a new takeoff possibility for Korean cooperative reference service.