A method and system for providing an emergency service are provided. The method includes broadcasting a channel message by a first mobile terminal in a no service state in response to a request for an emergency service, transmitting a corresponding response message to the first mobile terminal when a second mobile terminal receives the channel message from the first mobile terminal, forming a channel between the first mobile terminal and the second mobile terminal, and performing a communication according to the emergency service between the first mobile terminal and the second mobile terminal by using the formed channel.