An image processing device extracts additional information from image data and includes an input unit to input a plurality of image data items, an additional information extracting unit to extract an additional information item from each image data item, and a determining unit to determine a process to be performed for each image data item based on the extracted additional information item. The determining unit is configured to determine a process to be performed for an image-data group containing the plurality of image data items, based on a plurality of additional information items extracted from the plurality of image data items, and determine a process to be performed for each image data item based on one of the plurality of additional information items.