1. A digital camera comprising: an imaging unit operable to generate an image by photographing an object; a receiving unit operable to receive first information and second information relating to image processing from one or more transmission devices, wherein the second information indicates image modification corresponding to the object; a judging unit operable to judge whether the image is (i) to be output, (ii) to be processed and output, or (iii) not to be output, based on the information received by the receiving unit; and an output unit operable to, in accordance with the judgment made by the judging unit, (i) output the image to a memory, (ii) process and output the image to the memory, or (iii) discard the image, the memory being readable by the digital camera or an external device, wherein the receiving unit receives the first information from a first transmission device, and receives the second information from a second transmission device, wherein the judging unit makes the judgment based on the first information, wherein if the judging unit judges that the image is to be processed and output, the output unit performs the image modification indicated by the second information on the image, and outputs the modified image to the memory, wherein the output unit performs the image modification to make the modified image visually distinguishable from the image before the image modification, wherein the first information includes information indicating image modification, wherein, when the receiving unit receives the second information, the judging unit examines whether the receiving unit has received the first information, and wherein, if the receiving unit has received the first information, the judging unit judges that the image is to be processed and output, and the output unit performs the image modification indicated by the first information on the image, in addition to the image modification indicated by the second information.