My friend suggested me to open a business in this area (he has a new idea in the provision of digital TV services), how difficult to enter this market and what are the pitfall in this segment?
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It's likely quite difficult, as it is fairly expensive.
The largest hurtles are probably in building the starting infrastructure to distribute and supply the service; it's a huge up-front cost before you can even begin to earn any money from the service. Additionally, you'll have to strike up contracts with other service providers to bring their content to your service. There are reasons only the rich and established have really managed to work here, but who knows, the market in your area might support the endeavour.