Paper sheets processing apparatus and data transfer method

According to one embodiment, a paper sheets processing apparatus includes a first sub controller, a second sub controller, and a main controller. The first sub controller generates image data, based on an output signal from a camera which captures an image of a banknote transported along a transport path. The second sub controller generates sensor data, based on an output signal from a sensor which measures the banknote. The main controller inputs the image data and the sensor data of the same banknote from the first sub controller and the second sub controller, and transfers the image data and the sensor data to one external device indicated from a plurality of external devices.