A fraction of growing supermassive black holes are known to be luminous in radio wavelengths, which are referred to as radio-loud active galactic nuclei (AGNs). These radio-loud AGNs are expected to play important roles in the formation of massive galaxies by controlling the growth of galaxies via negative feedback from AGNs. In this topic, we will search for new radio-loud AGNs by combining large datasets in the optical (from Subaru HSC SSP) and radio (from JVLA, etc.) wavelengths, and the physical properties of these galaxies will be investigated via spectral energy distribution modeling