A coordinate measuring apparatus (100; 300), comprising: a touch panel comprising a plurality of electrodes (311-316, 321-326); a driver configured to generate a driving signal and to provide the driving signal to at least one of the plurality of electrodes of the touch panel; a receiver configured to receive a first receiving signal and a second receiving signal through at least one of the plurality of the electrodes, the second receiving signal corresponding to a signal transmitted from a coordinate indicating apparatus ; and a processor configured to: determine a change in capacitance among the plurality of electrodes of the touch panel based on the first receiving signal, determine a form of a user's grip on the coordinate indicating apparatus based on a size of an area where the change in capacitance is determined, determine an activation region of the touch panel based on the identified form of the user's grip and the second receiving signal and a remaining region of the touch panel as a deactivation region, wherein the processor is configured to control the activation region to identify at least one of a touch signal and the second receiving signal, and is configured to control the deactivation region to identify only the second receiving signal wherein the touch signal is a signal received by a touch input which is different from the user's grip. a touch panel comprising a plurality of electrodes (311-316, 321-326); a driver configured to generate a driving signal and to provide the driving signal to at least one of the plurality of electrodes of the touch panel; a receiver configured to receive a first receiving signal and a second receiving signal through at least one of the plurality of the electrodes, the second receiving signal corresponding to a signal transmitted from a coordinate indicating apparatus ; and a processor configured to: determine a change in capacitance among the plurality of electrodes of the touch panel based on the first receiving signal, determine a form of a user's grip on the coordinate indicating apparatus based on a size of an area where the change in capacitance is determined, determine an activation region of the touch panel based on the identified form of the user's grip and the second receiving signal and a remaining region of the touch panel as a deactivation region, wherein the processor is configured to control the activation region to identify at least one of a touch signal and the second receiving signal, and is configured to control the deactivation region to identify only the second receiving signal wherein the touch signal is a signal received by a touch input which is different from the user's grip. determine a change in capacitance among the plurality of electrodes of the touch panel based on the first receiving signal, determine a form of a user's grip on the coordinate indicating apparatus based on a size of an area where the change in capacitance is determined, determine an activation region of the touch panel based on the identified form of the user's grip and the second receiving signal and a remaining region of the touch panel as a deactivation region, wherein the processor is configured to control the activation region to identify at least one of a touch signal and the second receiving signal, and is configured to control the deactivation region to identify only the second receiving signal wherein the touch signal is a signal received by a touch input which is different from the user's grip. <EOS>