A sheet processing system comprising: a sheet processing apparatus; and a sheet counting apparatus, wherein the sheet processing apparatus includes: a conveying unit for conveying a sheet to be processed; a determination device for determining the sheet conveyed by the conveying unit; and an accumulation unit for accumulating a rejected sheet on the basis of a determination result given by the determination unit, wherein the sheet counting apparatus includes a counting device for counting the paper sheet, and the paper sheet counting apparatus counts the rejected sheet accumulated on the accumulation unit of the sheet processing apparatus, and having a transmitting unit that transmits an information about the counting result to a receiving unit of the paper sheet processing apparatus.