Display device and control method thereof

A display device comprising:

• a transceiver configured to communicate externally;
• a display having a display area for outputting content;
• a motor configured to control the display to expose a portion of the display area externally;
• and
• a controller configured to control the transceiver, the display, and the motor,
• wherein the controller is configured to:
• based on detecting an event while the display is in a first mode, change the display from the first mode to a second mode;
• and
• based on detecting the event while the display is in the second mode, change the display from the second mode to a third mode,
• wherein the first mode is a mode in which the display area is not exposed externally,
• wherein the second mode is a mode in which a portion of the display area is exposed externally,
• wherein the third mode is a mode in which an entirety of the display area is externally,
• wherein the detected event corresponds to detecting a wireless signal from a terminal of a user through the transceiver, and
• wherein based on the terminal being a wearable device executing a fitness-related application while the display is in the second mode, the controller is further configured to:
• control a portion of the display area to be exposed externally based on exercise information on the user received from the wearable device,
• wherein the externally exposed portion of the display area is increased in proportion to an exercise achievement corresponding to a percentage of an exercise goal achieved by the user received from the wearable device.