An electronic system comprising an image pickup unit 1, a computer 2, and communication terminals for connecting the unit and the computer, such as infrared communication ports 6, 10, a card slot 8, and serial communication terminals 5,9 wherein the necessary image data is allowed to be produced from the unit 1 and transmitted to the computer through the communication terminals. The computer communicates with the image pick up unit by examining the port of each communication means in order to recognize whether a connected unit is the image pickup unit or a foreign unit and to determine and store the communication speed for each communication port. The image data and memory space information is then automatically transmitted to the computer and displayed on a device connected to said computer.