Disclosed are a display apparatus including a display unit which displays an image thereon; a first image processor which processes an image signal based on a predetermined image processing operation, and displays an image based on the processed image signal; a first central processor which controls the display unit and the first image processor; and a first controller which grants a control right to the first central processor or to an upgrading apparatus, which upgrades the display apparatus, to control the display apparatus when the upgrading apparatus is connected to the display apparatus.