<p>The present invention provides a sheet sorting apparatus (1) comprising plural bins trays (B1-Bn); bin tray moving means (42, 43a) for moving said bin trays (B1-Bn) stepwise to cause each of the bin trays (B1-Bn) to face a sheet receiving position; and control means (110) for controlling the operating speed of said bin tray moving means (42, 43a) according to sheet transporting information of an image forming apparatus to be connected to said sorting apparatus (1), in such a manner that said bin tray moving means (42, 43) can be operated in continuous manner even during the discharge of a sheet (P) into a bin tray (B).</p>
