A display apparatus for post-processing the image of the contents, an image post-processor and a method for post-processing the image of the contents are disclosed. The display apparatus includes a communicator which communicates with a server, a display which displays contents received from the server, and a controller which determines an image post-processing method for elements of the contents based on source information of the contents and predetermined condition information, renders the elements which are post-processed according to the determined image post-processing method, and controls the display to display the contents generated after the rendering. Accordingly, the display apparatus can selectively implement image post-processing for the elements of the contents.