1. A communication terminal comprising: a fingerprint recognizer for receiving and recognizing a fingerprint pattern; a control unit for requesting registration of the received fingerprint pattern by displaying a symbol table previously stored in the communication terminal, activating the fingerprint recognizer to recognize the received fingerprint pattern when the control unit detects a symbol being preselected from the symbol table, matching the recognized fingerprint pattern with the preselected symbol, and storing the preselected symbol, wherein the control unit searches for the stored symbol when the fingerprint recognizer recognizes the registered fingerprint pattern following insertion of at least one character into a message performed by pressing keys of the communication terminal; and an output unit for inserting the searched symbol into the message in combination with the inserted at least one character.