The present invention carries out a desired image processing while using adjoining relationship between image parts. A public key may be exchanged via a predefined single BLUETOOTH\xae channel, thereby preventing a Man-in-the-middle attack. A message is issued to a security module at the first device, the message including the routable network address of the second device and the security policy. The plasma generating surface further includes a microwave power source. By means of the technical solution of the present invention, accessing solution between the fourth-generation communication system with the third-generation communication system based on the OFDM technology can be realized and the accessing time is shortened.