  We propose a new method of analysing a variable component for type 1 active
galactic nuclei (AGNs) in the near-infrared wavelength region. This analysis
uses a multiple regression technique and divides the variable component into
two components originating in the accretion disk at the center of AGNs and from
the dust torus that far surrounds the disk. Applying this analysis to the
long-term $VHK$ monitoring data of MCG+08-11-011 that were obtained by the
MAGNUM project, we found that the $(H-K)$-color temperature of the dust
component is $T = 1635$K $\pm20$K, which agrees with the sublimation
temperature of dust grains, and that the time delay of $K$ to $H$ variations is
$\Delta t\approx 6$ days, which indicates the existence of a radial temperature
gradient in the dust torus. As for the disk component, we found that the
power-law spectrum of $f_\nu \propto \nu^\alpha$ in the $V$ to near-infrared
$HK$ bands varies with a fixed index of $\alpha\approx -0.1$ -- +0.4, which is
broadly consistent with the irradiated standard disk model. The outer part of
the disk therefore extends out to a radial distance where the temperature
decreases to radiate the light in the near-infrared.
