Electronic device and method of controlling the same

An electronic device configured to be connected to at least one external electronic device, the electronic device comprising:

• a display unit;
• a communication unit configured to perform data communication with the at least one external electronic device;
• an interface unit configured to connect to a sound output device;
• and
• a controller connected to the display unit, the communication unit and the interface unit, wherein the controller is configured to:
• display a first content on the display unit, wherein the first content is associated with a second content which is being displayed on a first external electronic device of the at least one external electronic device,
• receive first audio data of the second content from the first external electronic device, only when the connection of the sound output device to the interface unit is detected while the electronic device displays the first content on the display unit,
• output the first audio data through the sound output device,
• after receiving the first audio data of the second content from the first external electronic device, receive second audio data which is generated by the first external electronic device, and output the second audio data through the sound output device, wherein the second audio data is not associated with the second content, and
• when the displayed first content is changed to a third content which is not associated with the second content, continue to output the first audio data through the sound output device.