Transmission and receiving of image data recorded on a digital still
camera to and from a server are controlled by a portable telephone set. At the
time of transmission, communication between the portable telephone set and the
digital still camera and communication between the portable telephone set and the
server are established. A reading command is issued from the portable telephone
set to the camera. Image data are transmitted in packet units to the portable telephone
set from the camera in response to the reading command. The image data is transmitted
to the server from the portable telephone set. At the time of receiving, when the
communication is established, all image data are transmitted to the portable telephone
set from the server. All the image data are transmitted to the camera from the
portable telephone set and are recorded in the camera. It is possible to control
the transmission and receiving of the image data by the portable telephone set.