In accordance with an embodiment, a sheet processing apparatus, containing a controller that acquires a predetermined data associated with a physical quantity of one of a driving motor or a driven member driven by the motor based on a predetermined signal, compare the predetermined data with a threshold value, and determine whether to transmit a request for increasing a discharge interval of a sheet based on the comparative result.

Provided is a paper-discharge apparatus that suppresses operating sound of the paper-discharge apparatus. A contact member changes the posture of the introduction guide by coming in contact with the introduction lever and rotating the introduction lever. A control unit sets a state in which paper is introduced to the paper-discharge-conveying unit to a non-contact state of the introduction lever and contact member, and sets a state when conveyed paper is guided to another discharge destination to a contact state of the introduction lever and the contact member. The control unit rotates the motor at a first speed and moves the contact member, and brings the contact member in contact with the introduction lever after setting the rotating speed of the motor to a second speed that is slower than the first speed.