method and system for sending messages are provided . the method may include : a head unit mounted on a vehicle providing a plurality of options each of which represents obtaining a corresponding piece of information ; the head unit receiving a user instruction of selecting at least one of the plurality of options ; the head unit obtaining at least one piece of information corresponding to the selected at least one option according to the user instruction ; the head unit composing a first message using the obtained at least one piece of information ; and the head unit sending to a first mobile device the first message and a request for forwarding the first message . drivers can send a message safely and conveniently when driving .