A control apparatus has a display unit, a first changing unit and a second changing unit. The display unit displays a print preview showing a print medium on which a sheet region corresponding to a predetermined paper size is provided. The first changing unit changes, based on a setting in a first setting item being changed, an orientation of the sheet region in the print preview displayed by the display unit. The second changing unit changes a positional relationship among a multiple pages on the print medium shown by the print preview based on a setting in a second setting item being changed by a user. Orientations of the multiple pages and the positional relationship and a setting in a second setting item are changed based on a change, by a first changing unit, of the orientation of the sheet region having the multiple pages arranged therein.