  We construct an extension of the recently proposed dynamical model for the
breaking of SU(5)$_{\rm GUT}$ gauge symmetry, in which a pair of massless
chiral supermultiplets for Higgs doublets are naturally obtained. We point out
that a model at a specific point in the parameter space of superpotential is
regarded as a low-energy effective theory of an N=2 supersymmetric gauge model
for the strongly interacting hypercolor sector.
