The present invention provides a method of supporting a download service in an open mobile business support system that can easily be provided with a complex process of user authentication, format conversion, and download for a mobile service for downloading contents of video and music files. In order to provide a biz template for dividing a download service into service function units of a mobile communication system, provide a standard API to an external CP / SP system, and download a service from the CP / SP system through the standard API. Upon receiving the request, the corresponding biz template is called to support user authentication, format conversion and URL reception, callback URL message delivery, and billing sequentially, thereby providing convenience and cost savings for the content provider.;Content, download service, mobile communication system
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