A method of providing a Karaoke service to mobile terminals through wireless connection between them. The mobile terminals are grouped as a service group and one of them is designated as a master mobile terminal and the other mobile terminals as slave mobile terminals. The master mobile terminal is connected to a Karaoke service provider through a mobile communication network and controls service content to be received from the Karaoke service provider in all the mobile terminals of the service group. If the master mobile terminal transmits a play command to the slave mobile terminals, all the mobile terminals start to play Karaoke music according to the service contents.