Display apparatus and control method thereof

A control method of a display apparatus including a transparent display unit, the control method comprising:

• displaying, by the transparent display unit, content including a first part and a second part based on a first direction in which a first user is located;
• receiving, by a sensor unit of the display apparatus, information sensed in a second direction opposite to the first direction;
• implementing, by a controller of the display apparatus, mirror flipping on the second part to be displayed in the second direction according to the received sensed information;
• and
• displaying, by the transparent display unit, the first part in the first direction and the mirror flipped second part,
• wherein the first part and the second part are included in same content, the first part is set to maintain the first direction in which the first user is located, and the second part is set to be mirror flipped based on the second direction,
• wherein the mirror flipped second part is alternately displayed in the first direction and the second direction for a predetermined period, and
• wherein the predetermined period is set based on at least one of a length of text and a number of words included in text when the second part includes text.