A method of displaying a schedule in a wearable device (110; 710, 910), the method comprising: connecting the wearable device (110; 710, 910) to a portable electronic device, the portable electronic device configured to synchronize a schedule with the wearable device (110; 710, 910); receiving a first user input for displaying the schedule on a display screen of the wearable device (110; 710, 910); receiving the schedule from the portable electronic device, the schedule comprising a preset amount of schedule data; and displaying the schedule on the display screen of the wearable device (110; 710, 910) in response to the first user input, wherein the schedule is displayed in a form of sector areas corresponding to a plurality of schedule items and each of the sector areas has an area proportional to a time of a corresponding schedule item from among a total time of schedule data which can be displayed on the display screen of the wearable device (110; 710, 910), and wherein the displaying of the schedule comprises: chronologically arranging sector areas corresponding to schedule items for a total display time from a reference time in a clockwise direction and displaying the sector areas on the display screen; changing the reference time if a second user input for changing the reference time is detected, wherein the second user input comprises either a circular movement of a rotatable bezel included in the wearable device (110; 710, 910), or a drag input in a circular direction on the display screen of the wearable device (110; 710, 910); transmitting a request for the corresponding schedule data to the portable electronic device, if a schedule data of a sector area corresponding to the changed reference time is not within the received preset amount of data. connecting the wearable device (110; 710, 910) to a portable electronic device, the portable electronic device configured to synchronize a schedule with the wearable device (110; 710, 910); receiving a first user input for displaying the schedule on a display screen of the wearable device (110; 710, 910); receiving the schedule from the portable electronic device, the schedule comprising a preset amount of schedule data; and displaying the schedule on the display screen of the wearable device (110; 710, 910) in response to the first user input, wherein the schedule is displayed in a form of sector areas corresponding to a plurality of schedule items and each of the sector areas has an area proportional to a time of a corresponding schedule item from among a total time of schedule data which can be displayed on the display screen of the wearable device (110; 710, 910), and wherein the displaying of the schedule comprises: chronologically arranging sector areas corresponding to schedule items for a total display time from a reference time in a clockwise direction and displaying the sector areas on the display screen; changing the reference time if a second user input for changing the reference time is detected, wherein the second user input comprises either a circular movement of a rotatable bezel included in the wearable device (110; 710, 910), or a drag input in a circular direction on the display screen of the wearable device (110; 710, 910); transmitting a request for the corresponding schedule data to the portable electronic device, if a schedule data of a sector area corresponding to the changed reference time is not within the received preset amount of data. chronologically arranging sector areas corresponding to schedule items for a total display time from a reference time in a clockwise direction and displaying the sector areas on the display screen; changing the reference time if a second user input for changing the reference time is detected, wherein the second user input comprises either a circular movement of a rotatable bezel included in the wearable device (110; 710, 910), or a drag input in a circular direction on the display screen of the wearable device (110; 710, 910); transmitting a request for the corresponding schedule data to the portable electronic device, if a schedule data of a sector area corresponding to the changed reference time is not within the received preset amount of data.