  We have studied the star-formation and AGN activity of massive galaxies in
the redshift range $z=0.4-2$, which are detected in a deep survey field using
the AKARI InfraRed (IR) astronomical satellite and {\em Subaru} telescope
toward the North Ecliptic Pole (NEP). The AKARI/IRC Mid-InfraRed (MIR)
multiband photometry is used to trace their star-forming activities with the
Polycyclic-Aromatic Hydrocarbon (PAH) emissions, which is also used to
distinguish star-forming populations from AGN dominated ones and to estimate
the Star Formation Rate (SFR) derived from their total emitting IR (TIR)
luminosities. In combination with analyses of their stellar components, we have
studied the MIR SED features of star-forming and AGN-harboring galaxies.
