Abstract: Disclosed is a monitoring and terminal control system through a linkage between a mobile terminal and a set-top box. A monitoring and terminal control system according to the present disclosure includes a protected person side set-top box which is installed at a protected person's home and communicatively connected to a protected person side mobile terminal when the protected person side mobile terminal is located at the protected person's home; and a service providing server which monitors a state of the protected person side mobile terminal when the protected person side mobile terminal and the protected person side set-top box are communicatively connected and controls the protected person side mobile terminal and/or the protected person side set-top box according to the monitoring result.