1. An image processing method comprising the steps of: obtaining information of an output destination of a document image stored in a memory; determining types of output information to be output for respective regions based on the information of the output destination and attributes of the respective regions in the document image; obtaining pieces of output information of the types to be output for the respective regions; combining the pieces of output information obtained for the respective regions into a document image; and outputting the combined document image to the output destination.