A touch sensor includes: a display panel to display an image, and including at least three touch sensing areas; at least one slave processor connected to a second touch sensing area from among the at least three touch sensing areas, and to generate touch coordinate data for the second touch sensing area; and a plurality of master processors connected to first and third touch sensing areas from among the at least three touch sensing areas, and to generate touch coordinate data for the first and third touch sensing areas, respectively. The at least one slave processor is to transmit the touch coordinate data for at least the second touch sensing area to any one of the plurality of master processors, or to another adjacent slave processor.