An electronic device (101, 310, 510, 601, 1010, 1110, 1201, 1610), comprising: a wireless communication circuit for wireless communication with an external device (330, 602, 1020, 1120, 1202); an augmented reality, AR, display configured to output an extended screen (590, 790, 1090, 1190, 1390, 1690, 1990, 2090) of a mobile device (320, 520, 1130, 1203); a memory configured to store therein computer-executable instructions; and a processor configured to access the memory and execute the instructions, wherein the instructions, when executed, cause the processor to: determine a reference display position (791, 1391) in an AR environment (500, 1000, 1100) at which the extended screen (590, 790, 1090, 1190, 1390, 1690, 1990, 2090) received from the mobile device (320, 520, 1130, 1203) is to be provided based on wireless communication with the external device (330, 602, 1020, 1120, 1202), when a portion of the extended screen (590, 790, 1090, 1190, 1390, 1690, 1990, 2090) to be provided at the reference display position (791, 1391) is comprised in a field of view, FOV, area of the AR display, provide a user with the portion of the extended screen (590, 790, 1090, 1190, 1390, 1690, 1990, 2090) through the AR display, and when the extended screen (590, 790, 1090, 1190, 1390, 1690, 1990, 2090) to be provided at the reference display position (791, 1391) is fully comprised in the FOV area of the AR display, provide a user with the entire area of the extended screen (590, 790, 1090, 1190, 1390, 1690, 1990, 2090) through the AR display. a wireless communication circuit for wireless communication with an external device (330, 602, 1020, 1120, 1202); an augmented reality, AR, display configured to output an extended screen (590, 790, 1090, 1190, 1390, 1690, 1990, 2090) of a mobile device (320, 520, 1130, 1203); a memory configured to store therein computer-executable instructions; and a processor configured to access the memory and execute the instructions, wherein the instructions, when executed, cause the processor to: determine a reference display position (791, 1391) in an AR environment (500, 1000, 1100) at which the extended screen (590, 790, 1090, 1190, 1390, 1690, 1990, 2090) received from the mobile device (320, 520, 1130, 1203) is to be provided based on wireless communication with the external device (330, 602, 1020, 1120, 1202), when a portion of the extended screen (590, 790, 1090, 1190, 1390, 1690, 1990, 2090) to be provided at the reference display position (791, 1391) is comprised in a field of view, FOV, area of the AR display, provide a user with the portion of the extended screen (590, 790, 1090, 1190, 1390, 1690, 1990, 2090) through the AR display, and when the extended screen (590, 790, 1090, 1190, 1390, 1690, 1990, 2090) to be provided at the reference display position (791, 1391) is fully comprised in the FOV area of the AR display, provide a user with the entire area of the extended screen (590, 790, 1090, 1190, 1390, 1690, 1990, 2090) through the AR display. determine a reference display position (791, 1391) in an AR environment (500, 1000, 1100) at which the extended screen (590, 790, 1090, 1190, 1390, 1690, 1990, 2090) received from the mobile device (320, 520, 1130, 1203) is to be provided based on wireless communication with the external device (330, 602, 1020, 1120, 1202), when a portion of the extended screen (590, 790, 1090, 1190, 1390, 1690, 1990, 2090) to be provided at the reference display position (791, 1391) is comprised in a field of view, FOV, area of the AR display, provide a user with the portion of the extended screen (590, 790, 1090, 1190, 1390, 1690, 1990, 2090) through the AR display, and when the extended screen (590, 790, 1090, 1190, 1390, 1690, 1990, 2090) to be provided at the reference display position (791, 1391) is fully comprised in the FOV area of the AR display, provide a user with the entire area of the extended screen (590, 790, 1090, 1190, 1390, 1690, 1990, 2090) through the AR display.