Is the strong anthropic principle too weak?

We discuss Carter's formula about the mankind evolution probability followi ng the derivation proposed by Barrow and Tipler. We stress the relation bet ween the existence of billions of galaxies and the evolution of at least on e intelligent life, whose living time is not trivial, all over the Universe . We show that the existence probability and the lifetime of a civilization depend not only on the evolutionary critical steps, but also on the number of places where the life can arise. In the light of these results, we prop ose a stronger version of Anthropic Principle.