2. The method of claim 1 , wherein the detecting of the request for the extraction of the dialog comprises: selecting the certain conversation partner according to a user input.
1. A method of controlling a group chat, the method comprising: controlling, by a controller, a display unit to display a group chatting window for the group chat, if a request of a user of a portable device for the group chat is detected through an input unit; detecting, by the controller, a request for an extraction of a dialog for at least one certain conversation partner of conversation partners in the group chat; if the request for the extraction of the dialog is detected, extracting, by the controller, the dialog of the at least one certain conversation partner from one or more dialogs in the group chat; and controlling, by the controller, the display unit to display the extracted dialog on a sub-chatting window, wherein the controller extracts automatically the dialog of the at least one certain conversation partner during the group chatting, and controls the display unit to display the dialog on the sub-chatting window.