A base unit of a radio communication apparatus of the present invention includes a controller that discriminates whether or not company identifying information transmitted from a cordless handset is specific information in connecting a line in a Bluetooth (BT) communication mode, performs communication in another radio communication standard (company's own mode) on determining that the company identifying information is the specific information, and performs the communication in a BT standard on determining that the company identifying information is not the specific information, and a registering unit for registering an ID peculiar to the apparatus. This simple structure allows long-distance communication at higher sound quality with the other apparatus capable of performing CDL communication in the company's own mode using an error handling function, and sound communication at usual sound quality in a BT data format allowing short-distance communication even when the company identifying information is not the specific information.