Disclosed is a sound playing system of a cluster which improves a driver's recognition of and quality of sounds played by the cluster. The sound playing system transmits driving information of a vehicle to a driver through the sound played by the cluster, and may include: a micom mounted in the cluster for supervising various controls such as sound control; a sound source chip mounted in the cluster for selecting sound sources according to a command of the micom; and a speaker for generating sound waves by the selected sound sources and outputting a sound. A database of sounds may be stored in the micom, and the micom may transmit information regarding sounds to the sound source chip based on the database so as to control selection of the sound sources.