1. An image processing apparatus comprising: an appearance data generating section for generating appearance data according to a drawing appearance of a processed document; a classification information producing section for producing, from the appearance data, classification information which is for classifying the processed document; a saving section for saving a data file of the processed document in a storage section together with the classification information of the data file; an inputting section to which appearance information of the processed document desired by a user is inputted; an appearance information converting section for converting the appearance information into the classification information and then outputting the classification information; and a searching section for searching the storage section to find the data file of the processed document consistent with the outputted classification information.