A sending communication terminal device includes a physical quantity detection sensor for detecting the physical quantities that affect the sending communication terminal device, and transmits the physical quantities as physical quantity data in a form to be distinguished from other types of data. The receiving communication terminal device extracts the physical quantity data from received data, analyzes the physical quantities, processes other kinds of received data or data that has been prepared in the receiving communication terminal device according to the analysis result, and outputs the processed data on the display.