A digital camera is provided with a plurality of group specifying keys for specifying a use purpose of a photographed picture. In an external flash memory of the digital camera that stores the photographed pictures, a plurality of index files that correspond to the group specifying keys are generated. When any one of the plurality of group specifying keys is pressed when at least one of the recorded pictures are displayed, file names of those displayed pictures are sequentially entered in an index file corresponding to that pressed group specifying key. When using the picture file, a personal computer reads out a plurality of picture files described in an index file corresponding to a desired use purpose to then conduct the corresponding processes based on that index file.