  Understanding infrared (IR) luminosity is fundamental to understanding the
cosmic star formation history and AGN evolution, since their most intense
stages are often obscured by dust. Japanese infrared satellite, AKARI, provided
unique data sets to probe this both at low and high redshifts. The AKARI
performed all sky survey in 6 IR bands (9, 18, 65, 90, 140, and 160$\mu$m) with
3-10 times better sensitivity than IRAS, covering the crucial far-IR
wavelengths across the peak of the dust emission. Combined with a better
spatial resolution, AKARI can much more precisely measure the total infrared
luminosity ($L_{TIR}$) of individual galaxies, and thus, the total infrared
luminosity density of the local Universe. In the AKARI NEP deep field, we
construct restframe 8$\mu$m, 12$\mu$m, and total infrared (TIR) luminosity
functions (LFs) at 0.15$<z<$2.2 using 4128 infrared sources. A continuous
filter coverage in the mid-IR wavelength (2.4, 3.2, 4.1, 7, 9, 11, 15, 18, and
24$\mu$m) by the AKARI satellite allows us to estimate restframe 8$\mu$m and
12$\mu$m luminosities without using a large extrapolation based on a SED fit,
which was the largest uncertainty in previous work. By combining these two
results, we reveal dust-hidden cosmic star formation history and AGN evolution
from $z$=0 to $z$=2.2, all probed by the AKARI satellite.
