Intrinsically faint galaxies in the early (z>6) epoch play a key role in the interpretation of the early galaxy formation and the cosmic reionization. To search for these galaxies, we survey a wide area of ~200 arcmin^2, identifying >300 high-z galaxy candidates. These candidates include apparently bright (H160~23 mag) sources strongly lensed by massive (>4x10e14 Msun) clusters of galaxies. Such bright sources will be good targets for JWST follow-up observations. We also investigate the intrinsic properties of the high-z galaxy candidates with lensing analysis.