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(Abridged) We report on the environmental dependence of properties ofgalaxies around the RDCSJ0910+54 cluster at z=1.1. We have obtained multi-bandwide-field images of the cluster with Suprime-Cam and MOIRCS on Subaru andWFCAM on UKIRT. Also, an intensive spectroscopic campaign has been carried outusing LRIS on Keck and FOCAS on Subaru. We discover a possible large-scalestructure around the cluster in the form of three clumps of galaxies. This ispotentially one of the largest structures found so far in the z>1 Universe. Wethen examine stellar populations of galaxies in the structure. Red galaxieshave already become the dominant population in the cores of rich clusters atz~1, and the fraction of red galaxies has not strongly changed since then. Thered fraction depends on richness of clusters in the sense that it is higher inrich clusters than in poor groups. The luminosity function of red galaxies inrich clusters is consistent with that in local clusters. On the other hand,luminosity function of red galaxies in poor groups shows a deficit of faint redgalaxies. This confirms our earlier findings that galaxies follow anenvironment-dependent down-sizing evolution. There seems to be a largevariation in the evolutionary phases of galaxies in groups with similar masses.Further studies of high-z clusters will be a promising way of addressing therole of nature and nurture effects on galaxy evolution.

The Environmental Dependence of Properties of Galaxies around the RDCSJ0910+54 Cluster at z=1.1