Charging of a camera 100 and backup of data are concurrently executed to enable picking up an image regardless of a remaining available memory. As the camera 100 is attached to a cradle 200, image data for the image picked up by a camera module 110 of the camera 100 is directly transferred to and recorded in a HDD 220 of the cradle 200. Image data, already recorded in the flash memory 133 of the camera 100, is backed up by the HDD 220 of the cradle 200. Further, the cradle 200 allows a charging circuit 204 to charge a rechargeable battery of the camera 100 using electric power supplied via an AC cord 280. Also, the cradle 200 has a tripod bore 270 through which the camera is fixed to a tripod for picking up the image.