A message transmitting method using a short message service (SMS) that can successively transmit messages that a mobile terminal user intends to transmit. According to the long message transmitting method using the SMS, in case that the message to be transmitted exceeds a predetermined length, identifiers representing a boundary of each predetermined unit of the message and an identifier representing that the message is divided and transmitted are inserted into the units of the message, and the message is divided and transmitted according to the inserted identifiers.