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Galaxies are believed to form in dark matter halos. In principle, we should be able to constrain the physical parameters of some dark-matter candidates by studying the properties of galactic halos. On the other hand, galaxy formation is believed to connect to the formation of the supermassive black hole located at the center of the galaxy; therefore, the formation and properties of active galactic nuclei (AGNs) should also be related to the dark matter halos. In this talk, I would like to show our results related to the studies of galaxies and AGNs and discuss possible effects on the connection between the dark matter halos and the supermassive black holes. I will also discuss some constraints about the properties of dark matter obtained from our investigations.