A display apparatus providing an augmented reality (AR) object and a controlling method thereof are provided. The display apparatus includes a display, a communication interface, a camera, and a processor configured to control the display to display a first image captured in real time by the camera, and based on first information about a first space included in a second image captured in real time by an external apparatus and location information of a first AR object provided in the first space of the second image being received, control the display to add a second AR object corresponding to the first AR object to the first image and display the second AR object based on second information about a second space included in the first image, the first information about the first space included in the second image, and location information of the first AR object provided in the first space.