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 a gesture input performed in 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 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.