  We study the interacting quantum dot coupled to the normal and
superconducting leads by means of a continuous-time quantum Monte Carlo method
in the Keldysh-Nambu formalism. Deducing the steady current through the quantum
dot under a finite voltage, we examine how the gap magnitude in the
superconducting lead and the interaction strength at the quantum dot affect
transport properties. It is clarified that the Andreev reflection and Kondo
effect lead to nonmonotonic behavior in the nonequilibrium transport at zero
temperature.
