A user is enabled to easily process a plurality of contents of a plurality of content providers. The technology of the present disclosure provides a content
processing method in which a plurality of content providers providing a plurality of contents, a
database including a plurality of contents, each including actual data, and a player are prepared and executed by a computer. The content includes or is associated with management information that manages the actual data, the management information including an identifier that uniquely identifies the content, an identifier of a user occupying the content, and an identifier of a content provider providing the content, a content
processing method for a player capable of causing at least a user-side
client device to reproduce each of a plurality of contents, the content
processing method having the steps of: authenticating a user by accepting information based on an identifier of the user via the user-side
client device; provided is an environment in which a
client device on the side of an authenticated user presents a set of content associated with an identifier of the authenticated user; receiving, via the client device, an identifier of the authenticated user-specified content; performing, in a
database, a search of whether the identifier of the received content is registered in association with the identifier of the authenticated user; and causing the client device to reproduce the specified content with respect to the player when the result of the search indicates that the identifier of the received content is registered in association with the identifier of the authenticated user.