To reproduce a sound with presence.

The reproduction system is composed of a plurality of mobile phones, and each of the plurality of mobile phones comprises an AV decoder for reproducing sound data of 5.1 channel, a GPS sensor for detecting a current location, and a wireless LAN circuit for communicating with any other mobile phone among the plurality of mobile phones. A master unit of one of the plurality of mobile phones comprises: location acquiring means (S03, S05) for acquiring locations of the plurality of mobile phones; an assignment means (S08) for assigning one or more channels of a plurality of channels to the plurality of mobile phones, respectively, based on locations of the plurality of mobile phones; and reproduction instruction means (S09, S10) for reproducing sound data of the one or more channels assigned to the plurality of mobile phones, respectively.