The invention relates to a system for generating various sounds corresponding to character strings resulting from an operation of an input device of a mobile communication terminal or computer terminal. The system comprises: a message input unit with which a character message to be transmitted is inputted in a transmitting terminal; a message setting unit that inputs a message to be transmitted to the message input unit and sets a type of the message as sound message; a user authentication unit that is connected to a communication network and confirms whether the user is a service subscriber or not when the message setting unit sets the message as sound message; a user database that is associated with the user authentication unit and stores information of the user therein; a sound generating means that, when the user is confirmed as a service subscriber by the user authentication unit, receives the message inputted through the message input unit to generate and transmit a sound corresponding to the received message to a receiving terminal; and a receiving terminal that receives the message and the sound transmitted from the sound generating means via the communication network.