A display apparatus, includes: a plurality of light emitting elements which emits light of colors respectively; a light sensing part which senses a spectrum emitted from the light emitting elements; adiffusing part which mixes light emitted from the light emitting elements to form a white light; and a control part which plurally changes and outputs predetermined driving values which make the light emitting elements emit light, receives a measured value from a light measuring device which measures the white light formed by the diffusing part whenever the predetermined driving values are changed, calculates tristimulus values out of the received measured value, and calculates a transformation matrix coefficient transformed out of the tristimulus values and a sensing value of the light sensing part.