1. Method of composing messages for speech output consisting of segments ( 10 ) of at least one original sentence, which are stored as audio files, in which a message intended for output is composed from the segments ( 10 ) stored as audio files, selected using search criteria from the stored audio files, characterised in that each segment ( 10 ) is allocated at least one parameter ( 12 ) characterising its phonetic properties in the original sentence and using the parameters ( 12 ) of the individual segments ( 10 ) characterising the phonetic properties in the original sentence a check is made as to whether the segments ( 10 ) forming the reproduction sentence to be output as a message are composed according to their natural flow of speech.