A knowledge sharing system includes a social network service (SNS) providing server that stores relationship information between a first user and a second user. The knowledge sharing system includes a knowledge sharing service providing server including a query data management unit that stores query data when the query data is transmitted from a first terminal of the first user and stores a query sharing request in association with the query data when the query sharing request is transmitted from a second terminal of the second user, and in the storing of the query sharing request, the query data management unit matches the query sharing request with the query data; and a query data providing unit that provides the query data matched with the query sharing request to a third terminal of a third user, where the third user is connected with the second user in the SNS platform.
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