A display apparatus is provided. The display apparatus includes a display including a plurality of display modules, and a processor configured to measure a first voltage according to a current flowing through reference pixels operating in a light reception mode by a light emitted from first adjacent pixels, to measure a second voltage according to a current flowing through reference pixels operating in the light reception mode by a light emitted from second adjacent pixels, and in response to a difference between the measured voltages is larger than or equal to a predetermined threshold value, to adjust a gain with respect to the second adjacent pixels based on amplitudes of the first voltage and the second voltage, and the first adjacent pixels are included in a different display module from the second adjacent pixels.