A touch input apparatus comprising: a light emitter configured to emit a plurality of light beams in a preset first direction and a second direction perpendicular to the first direction; a light receiver configured to receive the light beams emitted from the light emitter (110. 210); and a first processor configured to determine a touch input coordinate of a user based on a variation amount of each of the plurality of light beams received by the light receiver , wherein the first processor is configured to determine a touch input coordinate in response to change in light emitted in the first direction and the second direction being detected within a preset first time, and a light guider disposed on a lateral surface of the touch input apparatus , wherein the light emitter is disposed below the touch input apparatus and is configured to emit light to an outside of the touch input apparatus from an inside of the touch input apparatus ; wherein the light receiver is disposed below the touch input apparatus and is configured to receive light emitted to the inside of the touch input apparatus from the outside of the touch input apparatus ; and wherein the light guider is configured to receive light emitted from the light emitter , to emit the light to an upper portion of the touch input apparatus , to receive the emitted light to the upper portion of the touch input apparatus , and to emit the light to the light receiver , wherein the light guider comprises a plurality of reflective surfaces for changing an optical path so as to emit the light emitted from the light emitter in the first direction and the second direction, characterized in that the first processor is configured to suspend determination of a touch input coordinate in response to a determination that an optical change is detected only in one of the first direction and the second direction within the preset first time. a light emitter configured to emit a plurality of light beams in a preset first direction and a second direction perpendicular to the first direction; a light receiver configured to receive the light beams emitted from the light emitter (110. 210); and a first processor configured to determine a touch input coordinate of a user based on a variation amount of each of the plurality of light beams received by the light receiver , wherein the first processor is configured to determine a touch input coordinate in response to change in light emitted in the first direction and the second direction being detected within a preset first time, and a light guider disposed on a lateral surface of the touch input apparatus , wherein the light emitter is disposed below the touch input apparatus and is configured to emit light to an outside of the touch input apparatus from an inside of the touch input apparatus ; wherein the light receiver is disposed below the touch input apparatus and is configured to receive light emitted to the inside of the touch input apparatus from the outside of the touch input apparatus ; and wherein the light guider is configured to receive light emitted from the light emitter , to emit the light to an upper portion of the touch input apparatus , to receive the emitted light to the upper portion of the touch input apparatus , and to emit the light to the light receiver , wherein the light guider comprises a plurality of reflective surfaces for changing an optical path so as to emit the light emitted from the light emitter in the first direction and the second direction, characterized in that the first processor is configured to suspend determination of a touch input coordinate in response to a determination that an optical change is detected only in one of the first direction and the second direction within the preset first time. <EOS>