1. A method for managing a bookmark item and a content item, the method performed by a controller and comprising: transmitting, to a server, a creating request for creating the bookmark item using rendering state information and transporting state information, wherein the rendering state information is associated with a rendering control service and includes at least audio volume or display brightness, and wherein the bookmark item is created and the content item is updated to include a bookmark identifier (ID) of the created bookmark item for associating the content item with the created bookmark item; generating a deleting request, the deleting request instructing the server to delete the bookmark item; and transmitting the generated deleting request to the server, wherein deleting the bookmark item comprises: deleting the bookmark item comprising the bookmark ID for uniquely identifying the bookmark item, the rendering state information, the transporting state information, and a content ID of the associated content item; and updating the content item by deleting the bookmark ID from the content item when the bookmark item is deleted, the bookmark ID included in the content item being the same as the bookmark ID of the bookmark item to be deleted according to the deleting request, wherein the bookmark item is used for recovering the rendering state information and the transporting state information that are associated with playback of the content item, and wherein the transporting state information and the rendering state information are transmitted from a player to the controller and transmitted to the server from the controller.