Answer :

MattD
Television is one of the means of mass communication. It is very widespread. Humans can not live without him. They spend a lot of free time watching different TV programs. People eager to watch TV because you do not have to focus and imagine the situation as in the case of reading books or listening to the radio.
The other hand for cinema you have to pay and get out of the house.
TV is more easily accessible then cinema. You are usually few steps and one click away from turning it on. In order to get to the cinema you have to get to the theatre and pay.

TV is more popular then radio, because you give TV your full attention. Listening to the radio is usually just one of the things you are doing. There is not enough stimuli to keep your attention.
TV shows are also designed in an easily accessible way, where you don't have to think constantly, what message author wanted to deliver, you just consume the content. It doesn't tire you.