A method for associating content with a category is disclosed. The method includes the steps of: receiving a request for associating content with a category, where the request carries a content reference; obtaining a category according to the content reference, and associating the content reference with the category. A system and device for associating content with a category are also disclosed by the embodiments of the invention. With the embodiments of the invention, the association request function provides a content reference in an association creating request; the association management function obtains a category according to the content reference, and associates the content reference with the category. In this way, it is possible to associate the content with the category based on only the content information when there is a lack of a category. Therefore, the existing association information may be fully utilized to optimize association relationship and save data flow.