The invention relates to a method for synchronizing a mobile station to a base station, comprising in the base station a act of generating an information about a frequency of a channel which is used to transmit data about the identity of the base station and a act of transmitting the information from the base station to the mobile station.

A cordless base unit includes a controller that performs control in a case where an incoming call arrives from the landline telephone network, in such a manner that the cordless handset and the mobile information terminal perform sound ringing for the incoming call, that automatic answering starts after a predetermined time has elapsed and the sound ringing for the incoming call is stopped except for the mobile information terminal that is set to be used outside of the house, and that while the automatic answering is performed, the mobile information terminal that is set to be used outside of the house continues to perform the sound ringing for the incoming call.