  For an inhomogeneous high-Tc superconductor, band-filling dependence of
Josephson I_cR_n product is deduced at T=0 K by means of measurement; this is
an extension of the Ambegaokar - Baratoff (AB) theory based on the s-wave
theory. The product is given by J_{obs}R_n ={1.57}{rho}{Gap_i}={rho}J_iR_n,
where 0<{rho}<=1 is band filling (or local density), and {Gap_i} is the
intrinsic superconducting true gap and small. When {rho}=1, J_{obs}R_n=J_iR_n
is the intrinsic Josephson true product (or the AB product), where J_i is the
intrinsic Josephson true current occurring by Cooper pair. When 0<{rho}<1,
J_{obs}R_n is an average of J_iR_n over the measurement region and is the
effect of measurement. The J_{obs}R_n explains small I_cR_n values observed by
experiments. Furthermore, the intrinsic gap, 8.5<{Gap_i}<17 meV, is analyzed
from I_cR_n data of Bi-2212. d-wave superconductive components do not exist in
Bi-2212 crystals.
