A data processing apparatus includes a display portion, a control portion including a display control portion for causing the display portion to display a preview image of output target data, a touch sensor for receiving, on the display portion, a user operation for performing output setting for the output target data concerning the preview image, an output portion for outputting the output target data based on the output setting, and a control portion for, in a state where the display control portion arranges objects in page unit sequentially to be displayed as the preview image, when the touch sensor receives a predetermined pinch operation for the objects, performing page setting concerning the objects to be operated.