The invention relates to 
digital television receiving equipment, in particular to the management to the mother-son unit of the 
digital television receiving equipment. The invention discloses the mother-son 
unit system and the management method of the 
digital television receiving equipment which can avoid the large loss of the subscription fees of a 
broadcasting corporation or network operation corporation. The invention adopts the technical proposal that the equipment comprises digital television receiving equipment, a 
master card and a slave card, the digital television receiving equipment in which the 
master card is inserted is taken as a master 
machine, and the digital television receiving equipment in which the slave card is inserted is taken as a slave 
machine; the master 
machine and the slave machine are respectively provided with a master-slave card management module, the effective communication distance of the master-slave card management module is controlled within 100 m; the master-slave card management module reads slave card information and main card information, and accredits and validates the slave card information through the main card information, and the slave machine operates after the validation. The invention also discloses a method corresponding to the 
system. The invention has the advantages that the problem of one household with multiple machines is solved, and the problem of the large loss of the subscription fees of the 
broadcasting corporation or network operation corporation is avoided.