The disclosed embodiments relate to a content-recommendation method and apparatus, an electronic device, and a system. The method comprises: searching, by a recommendation system according to a determined tag, a content database for content matching the tag; and recommending, by the recommendation system, the matching content to a user corresponding to the tag. Content in the content database is determined according to first-type content acquired by an internal-operation system by means of matching and second-type content acquired by an external-operation system by means of matching.