A method of automatically calibrating a capacitance per channel performed by an apparatus for automatically calibrating capacitance per channel that comprises a touch sensing device including a plurality of touch sensing regions; a capacitance measurement and calibration device configured to measure parasite capacitances of channels connected to the plurality of touch sensing regions, respectively, and to add a unique calibration capacitance of each channel to a corresponding channel to acquire a preset reference capacitance when each channel is connected to the parasite capacitance, wherein the capacitance measurement and calibration device includes: a calibration controller configured to measure a parasite capacitance of each channel, to compare the measured parasite capacitance of each channel with the maximum parasite capacitance, and to generate a calibration control signal for each channel corresponding to a comparison result; and a capacitance calibration circuit including a plurality of capacitance calibration modules configured to add calibration capacitances for respective corresponding channels to the respective channels in response to the calibration control signal for each channel, the method comprising: measuring a parasite capacitance per channel, for measuring the parasite capacitance for each channel of the touch sensing device; detecting a maximum parasite capacitance, for detecting a largest parasite capacitance of the measured parasite capacitances for respective channels; generating a calibration control signal, for comparing the maximum parasite capacitance with the parasite capacitance of each channel and generating a calibration control signal for each channel in response to a difference in capacitance between the maximum parasite capacitance and the parasite capacitance of the channel; and adding a calibration capacitance to each channel, in response to a corresponding control signal, wherein the measuring the parasite capacitance per channel, the detecting the maximum parasite capacitance, and the generating the calibration control signal are performed by the capacitance measurement and calibration device; and wherein the adding the calibration capacitance is performed by the plurality of capacitance calibration modules. measuring a parasite capacitance per channel, for measuring the parasite capacitance for each channel of the touch sensing device; detecting a maximum parasite capacitance, for detecting a largest parasite capacitance of the measured parasite capacitances for respective channels; generating a calibration control signal, for comparing the maximum parasite capacitance with the parasite capacitance of each channel and generating a calibration control signal for each channel in response to a difference in capacitance between the maximum parasite capacitance and the parasite capacitance of the channel; and adding a calibration capacitance to each channel, in response to a corresponding control signal, wherein the measuring the parasite capacitance per channel, the detecting the maximum parasite capacitance, and the generating the calibration control signal are performed by the capacitance measurement and calibration device; and wherein the adding the calibration capacitance is performed by the plurality of capacitance calibration modules.