  The semiclassical theory for the large-N field models is developed from an
unusual point of view. Analogously to the procedure of the second quantization
in quantum mechanics, the functional Schrodinger large-N equation is presented
in a third-quantized form. The third-quantized creation and annihilation
operators depend on the field $\phi({\bf x})$. If the coefficient of the
$\phi^4$-term is of order 1/N (this is a usual condition of applicability of
the 1/N-expansion), one can rescale the third-quantized operators in such a way
that their commutator will be small, while the Heisenberg equations will not
contain large or small parameters. This means that classical equation of motion
is an equation on the functional $\Phi[\phi(\cdot)]$. This equation being a
nonlinear analog of the functional Schrodinger equation for the one-field
theory is investigated. The exact solutions are constructed and the
renormalization problem is analysed. We also perform a quantization procedure
about found classical solutions. The corresponding semiclassical theory is a
theory of a variable number of fields. The developed third-quantized
semiclassical approach is applied to the problem of finding the large-N
spectrum. The results are compared with obtained by known methods. We show that
not only known but also new energy levels can be found.
