How can you know the ATF type your Nissan Tiida 2007 sedan uses and whether transmission type is CVT or AT?

This car is called Versa in the United States. The 2007 Nissan Tiida has a 4 speed automatic transmission and not the CVT. In the U.S. you use Dexron III or you can purchase NISSAN Matic "D" ATF. Either will work just fine. Outside the U.S. it is more than likely the same but I am not 100% sure. Call your local dealer if you live outside the U.S. or Canada.