Q: SAFARI CANNOT OPEN THE PAGE BECAUSE IT IS NOT CONNECTED TO INTERNET

That's is correct. Thanks for the info.

So your question is?

You need Wi-Fi connection to your router on a iPad Wi-Fi model and 3G/LTE provision on a iPad Wi-Fi + Cellular model.

Do you have one of those? 

I think we can assume that the OP does have a wi-fi connection but he's getting this message.  It happens to me when I'm at my daughter's house - old Windows-friendly router.  I have to turn off wi-fi and then turn it on again and it works fine.  Doesn't happen at home with Apple router.