Abstract: Method for data transmission, in which an audiovisual media stream of a live (e.g., sporting) event, is transmitted by a first provider via the Internet and/or via at least one mobile radio network to a plurality of user terminals, and a data stream generated on the basis of the live event is made available by a second provider. The audiovisual media stream and the data stream are fed to a data preparation device, which generates a sequence of temporally spaced data packets and provides each data packet with identification information identifying the respective data packet and a time stamp. The generated data packets are synchronized with the media stream at controllable time intervals by the time stamp and sent via a bidirectional communication link by real-time transfer protocols and real-time streaming protocols to a group of user terminals for simultaneous playback synchronized with the audiovisual media stream.