Display apparatus and control method thereof

A display apparatus comprising:

• a transparent display panel;
• an image processor that processes an image signal to display an image on the transparent display panel based on the processed image signal;
• a sensor capable of sensing a user located in front of and behind the transparent display panel;
• and
• a controller that determines based on the sensing whether a user is located in front of or behind the transparent display panel, and if the image is displayed on the transparent display panel to be normally recognized by a user located in front of the transparent display panel, controls the image processor to selectively display on the transparent display panel a reverse image of the image to be normally recognized by a user located behind the transparent display panel according to the determination,
• wherein a user located in front of the transparent display panel faces a first surface of the transparent display panel and a user located behind the transparent display panel faces a second surface of the transparent display panel that is a different surface of the transparent display panel and opposing the first surface, and
• wherein the controller compares a number of users located in front of the transparent display panel sensed by the sensor with a number of users located behind the transparent display panel sensed by the sensor, and selectively displays the reverse image according to the comparison result.