frame 3 the slave device 22 is turned off or is switched to operate at different frequency in this case the master device 20 becomes unable to observe the transmission reception with the slave device 22 for over a certain period of time determines that the slave device 22 does not exist and internally treat it as being disconnected or transmits deauthentication frame next an example of the second operation to connect different groups will be explained with reference to fig7 fig7 is a sequence diagram showing an example of the second operation to connect different groups in the example illustrated in fig7 the master device 20 a and the slave device 22 a are connected and the master device 20 c is currently using the frequency 2 while the master device 20 a and the slave device 22 a are currently using the frequency 1 here in order to connect the master device 20 a and the slave device 22 a to the master device 20 c when a push button is pressed by a user in the master device 20 a and the master device 20 c s 404 the master device 20 a starts an active frequency scanning operation to search a connection destination this active frequency scanning operation enables the master device 20 a to receive the probe response from the master device 20 c at the frequency 2 s 412 and to.