20140148207 | COMMUNICATION SYSTEM AND COMMUNICATION TERMINAL CONNECTION METHOD - A communication system in which plural portable communication terminals present in a relatively narrow area are safely and securely matched and connected to each other by a simple operation, to exchange various types of information therebetween. When front sides of smartphone terminals are bought close to each other, either one of proximity sensors reacts or detects first. The reacted smartphone terminal allows a bottom speaker to generate ultrasound (e.g., 20 Khz), allows a back LED to light up, and stores the time at which the ultrasound has been detected. When the smartphone terminals are distanced from each other, both of the smartphone terminals stop detecting ultrasound by bottom microphones, and transmit a first reception time information and a second non-reception time information to a web server. The web server groups together and connects the two smartphone terminals, based on the received first time and second time. | 05-29-2014 |