In an image processing method, predetermined processing is performed with respect to a plurality of image signals, each of which is appended with grouping information representing that image signals appended with identical grouping information represent images associated with one another. In cases where the predetermined processing is performed with respect to a specific image signal, the predetermined processing is also performed with respect to all of image signals, which are appended with the same grouping information as the grouping information appended to the specific image signal. The predetermined processing may be image processing performed on the image signal or a processing for altering subsidiary information appended to the image signal.