Abstract: Provided are a mobile device and a method of changing a screen orientation of the mobile device. A method for changing a screen orientation of a mobile device includes: recognizing a motion of the mobile device; determining whether to change the screen orientation of the mobile device based on a first motion sensor of the mobile device; determining whether a viewing direction of a user of the mobile device is matched to the screen orientation of the mobile device based on at least one of the first motion sensor and a second motion sensor; and maintaining the screen orientation of the mobile device in response to a determination that the viewing direction of the user of the mobile device is matched to the screen orientation of the mobile device.

Abstract: An augmented reality filter selecting user equipment, includes a display unit display to display a real image including a target object and a plurality of filter icons, a user input unit to receive a user command, the user command including a selection of a target filter icon and a movement of the target filter icon, and a control unit to control the display unit to display the target object and filtered AR information corresponding to the target object. A method for selecting a filter includes displaying a real image including a target object and a plurality of filter icons, receiving a command to select a target filter icon, applying the target filter icon by moving the selected target filter icon onto a target object on the displayed image, and displaying the target object and information corresponding to the target object, in which the target filter icon is applied.