One of important directions in superstring theory is to reveal quantum nature of black hole. In this talk we embed Schwarzschild black hole into superstring theory or M-theory, which we call a smeared black hole, and resolve quantum corrections to it by including higher curvature corrections. Then we boost the smeared black hole along the 11th direction and construct a smeared quantum black 0-brane in 10  imensions. Quantum aspects of the thermodynamic for these black objects are investigated in detail. We also discuss inflationary cosmology which is caused by higher derivative corrections in M-theory.