A sheet processing method in a printing system constituted by a sheet processing apparatus including a plurality of paper discharge trays having different sheet stacking capacities, to any of whose paper discharge trays a printed sheet is discharged, and a printing apparatus includes setting which of the paper discharge trays is used first for discharging the sheet, specifying the number of remaining pages of sheets to be discharged by a job to be executed, and executing control for discharging the sheets starting from a paper discharge tray different from the set paper discharge tray according to the specified number of remaining pages and a restriction on a stacking amount on each paper discharge tray.