Abstract: A near field communication (NFC) terminal includes a controller to synchronize data; a communication unit to communicate the data with a second terminal via NFC; and a database to store permission information pertaining to the second terminal, wherein the controller synchronizes the data if the NFC terminal is within communication range of the second terminal and the stored permission information is valid. A method for data synchronization includes establishing a connection between the terminal and a second terminal via NFC; performing authentication between the terminal and the second terminal; and if the second terminal is authenticated, synchronizing data between the terminal and the second terminal via NFC.

Abstract: A user equipment to display an augmented reality (AR) window includes a display unit to display an image and AR windows corresponding to objects included in the image, and a control unit to determine an arrangement pattern of the AR windows by adjusting at least one of a size, a display location, a display pattern, and a color of the AR windows and to control the display unit to display the AR windows in the determined arrangement pattern, together with the objects. A method includes detecting the object in the image, generating the AR window corresponding to the object, determining an arrangement pattern of the AR window based on an adjustment of an attribute, and displaying the AR window in the determined arrangement pattern along with the object.