A data input system includes a display control unit that displays a plurality of list boxes configured to allow selection of one choice among a plurality of choices on a display screen, the plurality of list boxes placed side by side along a direction substantially orthogonal to a direction of receiving an input to change a choice selectable in each of the list boxes, and a control unit that determines both of a list box whose choice is to be changed among the plurality of list boxes and a direction of a change of a choice in the list box based on a position of a point input in a region including the plurality of list boxes on the display screen and a direction of indication indicating a motion from the point as a starting point.