1. An image storage apparatus comprising: image-picking up means for picking up a set of n images which are associated with each other; and recording means for recording in a memory the set of n images picked up by said image-picking up means together with first identification information indicating that each of the images belongs to the set, second identification information includes information representing a position of the image in a synthesized image to be synthesized from the images in the set, and third identification information, different from the first identification information, for searching an image which belongs to that set; and searching means for searching the image belonging to a particular set among a plurality of images stored in said memory on the basis of the first or the third identification information, wherein both said first and second identification information are included in a file name assigned to the image.