DATA COMMUNICATION SYSTEM CONTROL METHOD, PROGRAM, DATA COMMUNICATION SYSTEM, DATA COMMUNICATION DEVICE, AND INFORMATION PROCESSING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a data communication system control method capable of suppressing information leakage due to an information recording matter left behind.SOLUTION: When a distance between a portable terminal 102 carried by a user and an image forming apparatus 101 is a predetermined distance or more, that is "Near" or "Far", and an original remaining at the image forming apparatus 101 is detected, a data communication system 100 displays on the display unit 311 of the portable terminal 102 a warning message indicating that the original is left behind.SELECTED DRAWING: Figure 5B