BROADCAST RECEIVING APPARATUS, METHOD FOR OPERATING BROADCAST RECEIVING APPARATUS, INTERLOCKING APPARATUS INTERLOCKING WITH BROADCAST RECEIVING APPARATUS, AND METHOD FOR OPERATING INTERLOCKING APPARATUS

摘要

A broadcast receiving apparatus may comprise: a broadcast interface for receiving a broadcast signal comprising an emergency alert message and signaling information indicating metadata for the emergency alert message; a control unit for generating an emergency alert multicast message comprising attributes of the emergency alert message on the basis of the broadcast signal; and a companion screen interface for transferring the emergency alert multicast message to at least one companion screen device in a multicast mode.