A method for delivering multimedia data to a user device of a multimedia data delivery system is proposed, which includes, at a server device of the multimedia data delivery system, receiving, from the user device, a query message requesting service list data. The query message includes a parameter for querying custom service list data in relation to a user of the user device, and upon receiving the query message, generating a response message for transmission to the user device which includes a list of multimedia services customized for the user based on the parameter.