To provide a picture data transfer system, an electronic camera, and a communication terminal which surely prevent the remaining memory capacity in a digital camera from running out in the picture data transfer system where picture data photographed by the digital camera is transferred to a server through the communication terminal such as a portable telephone.

When the remaining memory capacity for preservation of picture data is reduced to a prescribed value or smaller in a digital camera 10, a signal of a service information request is transmitted to a communication terminal 12. Then the communication terminal 12 automatically connects a line to a server 16 and acquires service contents from the server 16 and displays acquires service contents. When a user selects, for example, a picture preservation service and instructs transfer of picture data, the digital camera 10 transfers picture data in the memory for preservation to the server 16 through the communication terminal 12 and erases transferred picture data from the memory for preservation. Thus the empty capacity of the memory for preservation is secured.