A voice-controlled data system may include a data storage unit including media files having associated file identification data, and a vocabulary generating unit generating phonetic data corresponding to the file identification data, the phonetic data being supplied to a speech recognition unit as a recognition vocabulary, where one of the media files may be selected according to a recognized speech control command on the basis of the generated phonetic data, where the file identification data include a language identification part for identifying the language of the file identification data, and where the vocabulary generating unit generates the phonetic data for the file identification data of a media file based on its language identification part.