A context processing unit receives an environmental signal from a registration unit of a motor vehicle. The environmental signal describes an item of information, independent of a movement direction of the motor vehicle, regarding an event in an environment of the motor vehicle. The event establishes a predetermined thematic context of media content of an output file. The predetermined media content of the output file is changed in dependence on the thematic context of the media content, so that a virtual environment described by the changed media content takes into consideration the information of the event in the environment of the motor vehicle with respect to context. The output file with the changed media content is transmitted to a display unit of an output device which outputs the output file.