  We study the methods and their accuracies for determining tan$\beta$ in two
Higgs doublet models at future lepton colliders. In addition to the previously
proposed methods using direct production of additional Higgs bosons, we propose
a method using the precision measurement of the decay branching ratio of the
standard-model (SM)-like Higgs boson. The method is available if there is a
deviation from the SM in the coupling constants of the Higgs boson with the
weak gauge bosons. We find that, depending on the type of Yukawa interactions,
this method can give the best sensitivity in a wide range of tan\beta.
