The country whose people use most time to use Internet

Countries that spend the most time online

I heard an interesting fact from a TV show.
The people who spend the most time on the Internet are the Brazilians. They spend about 8-9hours a day.
And Japan is the country which spends the least amount of time on the Internet, at 3.5 hours a day.
Maybe that research doesn't include all countries.
Since it's a vague memory, don't take it seriously.

The country whose people use spend the most time to use using the Internet

Overall, I can understand you perfectly. There are some things to tidy up, however.

Time is spent, not used. (eg. I spent an hour on italki today.)

The Internet is used. (eg. You are using the internet right now.)

Don't start sentences with "And"!

"Low" can be used as an insult... don't describe countries in this way, particularly your own! It's best to clarify what "low" applies to, in this case, time spent.

"...doesn't include all countries" is better because it makes "countries" general. Saying "all [of] the countries" implies we are talking about a specific group of countries - eg. "all of the Asian countries", "all of the countries involved in the deal", etc.

Lastly, if your entry refers to itself, don't use "it". Using "it" implies you are referring to the research! Saying "this" makes it clear that you are referring to the whole thing.