There is provided a method of easily inputting icons representing user emotions (emoticons). In the emoticon input method in a mobile terminal, a plurality of 5 emoticons, formed by utilizing a plurality of typical characters and special characters in combination, are grouped and stored by groups in the mobile terminal. The mobile terminal enters an emoticon input mode, displays the stored emoticon groups, displays the emoticons of an emoticon group selected by a user, stores an emoticon selected by the user, and transmits an SMS message including at least one emoticon selected by the user.