  On the basis of the experimental data allowing existence of the anomalies
going beyond the minimally extended Standard Model with three active neutrinos
with different masses, we consider the generalized model with three active and
three sterile neutrinos, one of which is relatively heavy ((3+1+2)-model). We
study the basic characteristics that are used to describe the massive active
and sterile neutrinos, the methods to determine the absolute scale of neutrino
masses and the neutrino mass estimates based on the available experimental
data. Taking into account the possible contributions of the sterile neutrinos,
the dependences of the neutrino mass characteristics on the sterile neutrino
mass are plotted. The results obtained can be used to interpret and to predict
the results of various neutrino experiments.
