1. An image processing system comprising: a reading section which reads a document image to obtain an image data; an impact detecting section to detect an impact; an identifying section which identifies an image data obtained by reading the document image using the reading section upon receiving an impact, when the impact is detected by the impact detecting section during a reading operation of the document image using the reading section; and an outputting section which visualizes and outputs the image data identified by the identifying section for an operator.