A radio broadcast system using a second communication channel provides an interactive functionality to allow a user to know what song or piece of music is playing on the first, radio channel and possibly other details about what is being listened to. A data transmission from the broadcast station is received by a server with additional information about the content of the first channel, and after the server determines mobile terminal devices to be updated with the additional information, it generates updating messages comprising the additional information, and updates the information to the determined terminal devices via a wireless communication network. The updated information is then received by a given terminal device and displayed on a display of the device.