IPTV and method for controlling emergency alert system widget in IPTV

1. A method of controlling data for an emergency alert system (EAS) in a digital broadcast receiver, the method comprising:

downloading and installing an EAS widget application without regard for a system of the digital broadcast receiver, wherein the EAS widget application calls EAS extension Application Programming Interface (API), wherein the EAS extension API includes a first API used to limit partial functionality of the IPTV during execution of the EAS widget application, a second API used to determine a region in which the IPTV is located using an IP address of the IPTV, and a third API used to allow the EAS widget application to be displayed in a layer above other widget applications, and;

receiving a digital broadcast signal including an emergency alert table including a uniform resource identifier (URI) descriptor;

detecting a URI address included in the URI descriptor;

accessing the URI address;

receiving additional emergency alert information from the URI address; and

controlling to display the additional emergency alert information on a screen of the digital broadcast receiver.

2. The method according to claim 1 , wherein the method further includes executing the EAS widget application.

3. The method according to claim 2 , wherein the controlling step includes performing control to display the additional emergency alert information on the EAS widget application using the URI address.

4. The method according to claim 2 , wherein the EAS extension API further includes a fourth API used to most preferentially perform access to an EAS server, and a fifth API used to forcibly tune to an EAS channel.

5. A method of controlling an emergency alert system (EAS) widget application in an IPTV, the method comprising:

downloading and installing the EAS widget application without regard for a system of the IPTV, wherein the EAS widget application calls EAS extension Application Programming Interface (API), wherein the EAS extension API includes a first API used to limit partial functionality of the IPTV during execution of the EAS widget application, a second API used to determine a region in which the IPTV is located using an IP address of the IPTV, and a third API used to allow the EAS widget application to be displayed in a layer above other widget applications;

executing the EAS widget application;

directly receiving additional emergency alert information from an EAS server connected to an Internet protocol (IP) network; and

performing control to display the additional emergency alert information on the EAS widget application.

6. The method according to claim 5 , wherein the receiving step includes:

identifying a region in which the IPTV is located; and

accessing an EAS server corresponding to the identified region.

7. The method according to claim 5 , wherein the receiving step includes receiving the additional emergency alert information from an EAS server in which information identifying a region in which the IPTV is located has been previously registered.

8. The method according to claim 5 , wherein the EAS extension API further includes a fourth API used to most preferentially perform access to an EAS server, and a fifth API used to forcibly tune to an EAS channel.

9. A digital broadcast receiver for controlling data for an emergency alert system (EAS), the digital broadcast receiver comprising:

a network interface module configured to download an EAS widget application without regard for a system of the digital broadcast receiver, wherein the EAS widget application calls EAS extension Application Programming Interface (API), wherein the EAS extension API includes a first API used to limit partial functionality of the IPTV during execution of the EAS widget application, a second API used to determine a region in which the IPTV is located using an IP address of the IPTV, and a third API used to allow the EAS widget application to be displayed in a layer above other widget applications;

a widget managing module configured to install the downloaded EAS widget application into the IPTV;

a tuner configured to receive digital broadcast signal including an emergency alert table including a uniform resource identifier (URI) descriptor;

a detecting module configured to detect a URI address included in the URI descriptor;

an accessing module configured to access the URI address;

a receiving module configured to receive additional emergency alert information from the URI address; and

a controlling module configured to perform control to display the additional emergency alert information on a screen of the digital broadcast receiver.

10. An Internet protocol television (IPTV) for controlling an emergency alert system (EAS) widget application, the IPTV comprising:

a network interface module configured to download the EAS widget application without regard for a system of the digital broadcast receiver, wherein the EAS widget application calls EAS extension Application Programming Interface (API), wherein the EAS extension API includes a first API used to limit partial functionality of the IPTV during execution of the EAS widget application, a second API used to determine a region in which the IPTV is located using an IP address of the IPTV, and a third API used to allow the EAS widget application to be displayed in a layer above other widget applications;

a widget managing module configured to install the downloaded EAS widget application into the IPTV;

an executing module configured to execute the EAS widget application;

a receiving module configured to receive directly additional emergency alert information from an EAS server connected to an Internet Protocol (IP) network; and

a controlling module configured to perform control to display the additional emergency alert information on the EAS widget application.