An image processing apparatus having: an image data inputting section; a storage section that stores image data that has been input from the inputting section; a processing section that carries out output processing of the image data; a history management section that establishes correspondence between history information of the output processing and the image data and manages the history information; a warning section; and a control section that, in response to a deleting request for the image data stored in the storage section, based on the history information of the output processing, changes a mode of the warning given out by the warning section of confirming the deleting of the image data.