Connection establishment method, connection establishment device and communication system

The invention proposes a connection establishment method, a connection establishment device and a communication system. The connection establishment method comprises the steps of: receiving first biometric identification information acquired from a first terminal, and receiving second biometric identification information acquired from a second terminal; judging whether biometric identification information, which is matched with any biometric identification information in the first biometric identification information and the second biometric identification information, exists in any trust group of at least one trust group; and controlling the first terminal to establish connection with the second terminal when the judgment result is yes and the biometric identification information, which is matched with the other biometric identification information in the first biometric identification information and the second biometric identification information, exists in the any trust group. By adopting the connection establishment method, the connection establishment device and the communication system, the connection between terminals can be established more safely and quickly, thereby enhancing user experience.