An apparatus and method for upgrading a software, including a version comparing unit for comparing a version of a software code and a version of a previously installed software code to determine a newer version and an upgrade processing unit for installing the software by abstracting software data in the software code, can automatically install an upgraded system software in a corresponding apparatus for receiving digital broadcasting by detecting the code of the system software simultaneously included in an advertisement broadcasting and an advertisement broadcasting signal.

 
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< System and apparatus for adjusting a clock speed based on a comparison between a time required for a scheduler function to be completed and a time required for an execution condition to be satisfied

< Method for displaying reservation guide/confirmation screen in a TV

> Virtual channel table for a broadcast protocol and method of broadcasting and receiving broadcast signals using the same

> Remote control system in mobile communication terminal and method thereof
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