Touch screen device and method of selecting files thereon

A method of selecting files using a touch screen device for a portable terminal, the portable terminal having a screen of a prescribed viewing area in x and y directions, the method comprising:

• detecting an initial touch point within a prescribed portion of the prescribed viewing area;
• detecting a moving touch trajectory in a first direction on a surface of the screen, wherein the moving touch trajectory includes a substantially straight line, the substantially straight line initiating at the initial touch point and ending at a release touch point, and is determined based on x and y coordinates of the prescribed viewing area;
• and
• executing at least one predetermined command based on the moving touch trajectory, the at least one predetermined command comprising at least one of detecting and marking a file list and skipping files in the file list, detecting and marking a file list and changing an execution order of files in the file list, or scrolling through a file list, wherein the executing step comprises maintaining the touch to continue scrolling until a desired file is located, and releasing the touch to mark the file list and skip the marked files in the file list, or to mark the file list and change the execution order of files in the file list, wherein when the file list is marked based on the moving touch trajectory, the file list includes files within a range that is defined by a rectangle with a diagonal equal to the substantially straight line of the moving touch trajectory, and wherein a different command is executed based on whether or not the initial touch point of the moving touch trajectory is the same as the release touch point of the moving touch trajectory.