We have performed an angle-resolved photoemission study of the nodal quasiparticle spectra of the high-Tc cuprate trilayer Bi2Sr2Ca2Cu3O10+δ (Tc∼110 K). The spectral weight Z of the nodal quasiparticle increases with decreasing temperature across Tc. Such a temperature dependence is qualitatively similar to that of the coherence peak intensity in the antinodal region of various high-Tc cuprates, although the nodal spectral weight remains finite and large above Tc. We attribute this observation to the reduction of electron correlation strength in going from the normal metallic state to the superconducting state, a characteristic behavior of a superconductor with strong electron correlation.