Communication system, communication apparatus, communication method, communication control method, communication control program and program storage medium

A communication control method for controlling communication apparatus for communicating in conformity with predetermined communication standards among a plurality of communication apparatus by setting predetermined system information common to the communication apparatus. The communication apparatus communicates with another communication apparatus having an authentication processing means for executing an authentication process in accordance with authentication information. A state is established in which an output level of a transmission signal is lowered and data having a reception signal level lower than a predetermined value is discarded and by setting common system information. A signal representative of a connection start is transmitted based on the common system information. In response to the connection start signal, authentication information is transmitted, new system information is authenticated by the authentication processing means, the received new system information is set and communication based on the new system information is performed.