One of the most difficult missions in studying environments at high redshift is
statistics. We present the average infrared dust emission from a protocluster over z = 1
- 4 studied using the Planck and WISE infrared all-sky surveys.  By a stacking analysis
of the WISE and Planck images at the locations of the largest catalog of protoclusters
at z ~4 from the Hyper Suprime-Cam Subaru Strategic Program Survey (HSC-SSP), we
successfully showed the average mid to far infrared emission from a protocluster in Kubo
et al. (2019). We performed a similar stacking analysis for luminous radio galaxies at z
= 1 - 3 (N=100-300 at \delta z=0.5) to show the evolution of the obscured star formation
and AGN activities in protoclusters on average. The average star formation rate and AGN
emission continuously increase toward higher redshift. By the way, the evolution of the
AGN emission is modest compared to the evolution of the star formation rate. It suggests
a possible difference between the mass assembly timescale of galaxies and black holes in
clusters. We plan to expand this analysis with the upcoming protocluster catalog from
the Euclid mission.