| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication system and the like that a plurality of mobile communication terminals situated within a relatively narrow range can be matched safely and surely by a simple operation and be connected with each other and that can exchange various information.SOLUTION: When front surfaces of smart phone terminals 1a and 1b are brought closer to each other, any one of proximity sensors reacts or detects in first. The reacted smart phone terminal 1 generates an ultrasonic sound (for example, 20 kHz) from a bottom speaker 15b, turns on a rear LED 19, and records clock time when the ultrasonic sound was detected. When they are brought farther, both smart phone terminals 1a and 1b become in a state in which they do not detect the ultrasonic sound from their bottom microphones 14b and transmit first clock time (reception clock time information) and second clock time (non-reception clock time information) to a Web server 200. The Web server 200 groups and connects the two smart phone terminals 1 on the basis of the received first clock time and second clock time. |
