  2-color QCD at finite temperature T and chemical potential \mu is revisited
in the strong coupling limit on the lattice. The phase structure in the space
of T, \mu and the quark mass m is elucidated with the use of the mean field
approximation and the large dimensional expansion. We put special emphasis on
the interplay among the chiral condensate, the diquark condensate and the quark
density in the T-\mu-m space. Qualitative comparison is made between our
results and those of recent Monte-Carlo simulations in 2-color QCD.
