1. A method for executing a function executing command through a gesture input, the method comprising: displaying a keyboard window for inputting text and a text input field for displaying the text inputted by the keyboard window on a touch screen display; recognizing one of gesture inputs performed in the text input field, wherein the gesture inputs include gesture inputs from an upper area, a lower area, a left area, a right area, an upper right area, a lower right area, an upper left area, or a lower left area of the text input field; and executing a function executing command corresponding to the gesture input only when the text displayed in the text input field is not selected, wherein each of the gesture inputs corresponds to a different function; wherein the text input field for displaying the input text and the keyboard window for inputting the text are formed in different areas from each other, a display area hidden by a menu window or an icon on the touch screen display is minimized, the gesture input is a drag input, and the function executing command is a command for replacing a command corresponding to the menu window or the icon of an application being currently run.