An image processing apparatus of the present invention includes: an appearance data generating section 21 for generating appearance data according to a drawing appearance of a processed document; a classification information producing section 22 for producing, from the appearance data, classification information for classifying the processed document; a data file save processing section 23 (saving section) for saving in a storage section a data file of the processed document together with the classification information of the data file; an appearance information inputting section 15 (inputting section) for inputting the appearance information of the processed document desired by a user; an appearance information converting section 29 for converting the appearance information into classification information to output the classification information; and a searching section 26 for searching the storage section 26 to find the data file of the processed document consistent with the outputted classification information. This enables the user to search the processed document easily and quickly to reuse it.