  A new approach for calculating spectral density functions of strongly
correlated electron systems is proposed within the exact diagonalization method
of dynamical mean-field theory (DMFT). This approach is based on the analytic
continuation of spectral density function obtained by conventional exact
diagonalization method of DMFT and its results are more reasonable in shape. As
an example of its application, the Mott transition in a strongly correlated
electron system is investigated using this new approach.
