A method of controlling group chatting in a portable device, and a portable device performing the same, which are capable of extracting and displaying a dialog of a certain conversation partner on a sub-chatting window are provided. The method includes detecting a request for an extraction of a dialog for at least one certain conversation partner from conversation partners in the group chat, extracting the dialog of the at least one certain conversation partner from one or more dialogs in the group chat, and displaying the extracted dialog on a sub-chatting window.