A method of sending an integrated message using a portable device according includes executing an integrated message application supporting a plurality of channels including at least two channels having different messaging schemes. An input window permits entry of a message, and the message is displayed on a message display window. In response to a user selection for displaying icons of a hidden state that corresponds to the plurality of respective channels, displaying the icons corresponding to the plurality of respective channels in response to the user choice, and sending the message using at least one activated channel of the plurality of channels.