  We study a two-band Hubbard model using the dynamical mean-field theory
combined with the exact diagonalization method. At the electron density $n=2$,
a transition from a band-insulator to a correlated semimetal occurs when the
on-site Coulomb interaction $U$ is varied for a fixed value of the
charge-transfer energy $\Delta$. At low temperature, the correlated semimetal
shows ferromagnetism or superconductivity. With increasing doping $|n-2|$, the
ferromagnetic transition temperature rapidly decreases and finally becomes zero
at a critical value of $n$. The second-order phase transition occurs at high
temperature, while a phase separation of ferromagnetic and paramagnetic states
takes place at low temperature. The superconducting transition temperature
gradually decreases and finally becomes zero near $n=1$ ($n=3$) where the
system is Mott insulator which shows antiferromagnetism at low temperature.
