  We examine whether parameters related to the Higgs sector of the minimal
supersymmetric standard model can be determined by detailed study of the
production cross section and decay branching ratios of the Higgs boson.
Assuming that only the light Higgs boson will be observed at a future $e^+e^-$
linear collider with $\sqrt{s}=300\sim500$ GeV, we show that values of
$m_{susy}$ and $\tan\beta$ are restricted within a narrow region in the
$m_{susy}$ versus $\tan\beta$ plane by the combined analysis of the light Higgs
properties. It is also pointed out that, in some case, $\tan\beta$ may be
restricted to a relatively small value, $\tan\beta=1\sim5$.
