To provide a high-functionality serial communication PAN of USB3.0 with a link layer having high reliable communication control function, and technology for verification and authentication.

Security and safety in a case of emergency are provided in a communication path or a network by using technology for mutual authentication and verification, such as communication path specification by a serial communication link layer between a physical layer and a protocol layer, which is standardized and implemented in serial communication USB3.0, random number generation in both of communication terminals, hash value calculation, an encoding engine, or the like. A small-scale personal area network (PAN) having finite nodes and based on serial communication is configured by adding and deleting dynamic addresses in connection devices, which allows data to be shared and differentiated, provides advanced security for transmission information from times or locations, and realizes a high reliable control security network which prevents various kinds of fraudulent acts or program tampering in the communication path or the network.