A touch sensing system includes a touch screen including touch sensors and sensing lines, the touch sensors and the sensing lines being divided into first and second sensing areas, a first touch sensing integrated circuit (IC) sensing a touch input of the first sensing area using a signal received through receiving channels, a second touch sensing IC sensing a touch input of the second sensing area using a signal received through receiving channels separated from the receiving channels of the first touch sensing IC, differential amplifiers between the sensing lines and the receiving channels of the first and second touch sensing ICs, and a switch connecting a sensing line, which is closest to the first sensing area among the sensing lines of the second sensing area, to an Nth differential amplifier connected to a last receiving channel of the first touch sensing IC.