A voice notifying service system and a service providing method are provided for a mobile terminal, wherein the voice notifying service system includes a mobile communication system and a mobile terminal for forming a communication channel with the mobile communication system, transmitting voice information, the voice information including a voice and a notifying function for playing the voice, to the mobile communication system, transmitting time information to the mobile communication system specifying the time at which the voice information is to be transmitted to the mobile terminal, and playing the voice information when received from the mobile communication system at the time specified in the time information.