The Language Tree

I came across this on the net. It's a tree (click on to see more clearly) and chart outlining the Indo-European languages. In terms of human evolution, what does this chart tell us about the origins of the Europeans? More than likely Europeans evolved from Cro Magnon people migrating out of the Middle East and India, as the oldest and only languages pointing to a different geographical region are Iranian, Indic, and Anatolian.

I'm wondering about all the African languages, and the Asian languages. Did the Asian languages come from a separately evolving Homo-Erectus group? Are the languages of Southern Africa unrelated to the Indo-European languages because the people stayed put and did not migrate like the Northern Africans and Middle Easterners?