1. A document OCR implementing device, comprising: a reading part configured to read a document and form a recognition image; an obtaining part configured to perform image processing of the recognition image and obtain a state of the recognition image; a plurality of OCR engines configured to perform a character recognition process of the recognition image; and a designating part configured to designate the OCR engine by combining the recognition image and the OCR engine; wherein the character recognition process is implemented by using the OCR engine designated by the designating part.