1. A method of managing an ability of a proofreader who proofreads an electronic document generated from a recognition target document by executing character auto recognition programs, said method comprising: a step of estimating a character count of potential mis-recognized characters contained in the electronic document; a step of detecting a mis-recognized character discover count with which the proofreader discovers the mis-recognized characters in the electronic document; a step of detecting a processing time spent for proofreading the electronic document; and a step of calculating a score relative to a proofreader ability based on a ratio of the mis-recognized character discover count per unit time to the potential mis-recognized character count.