A method for group messaging at a mobile terminal in autonomous network includes acquiring a message and a list of target identifiers, containing the identifiers of multiple mobile terminals to which the message is to be sent; transmitting the message via the autonomous network to any mobile terminal of the multiple mobile terminals that locates in the autonomous network, and removing the identifier of the mobile terminal from the list of target identifiers to obtain an updated list of target identifiers; generating an aggregate message, wherein the aggregate message contains the message and the identifiers in the updated list; sending the aggregate message to a base station if the length of the aggregate message does not exceed a threshold; dividing the aggregate message into multiple fragment messages and sending the multiple fragment messages to the base station if the length of the aggregate message exceeds the threshold.