  The circumstellar (CS) environment is key to understanding progenitors of
type Ia supernovae (SNe Ia), as well as the origin of a peculiar extinction
property toward SNe Ia for cosmological application. It has been suggested that
multiple scatterings of SN photons by CS dust may explain the non-standard
reddening law. In this paper, we examine the effect of re-emission of SN
photons by CS dust in the infrared (IR) wavelength regime. This effect allows
the observed IR light curves to be used as a constraint on the position/size
and the amount of CS dust. The method was applied to observed near-infrared
(NIR) SN Ia samples; meaningful upper limits on the CS dust mass were derived
even under conservative assumptions. We thereby clarify a difficulty associated
with the CS dust scattering model as a general explanation for the peculiar
reddening law, while it may still apply to a sub-sample of highly reddened SNe
Ia. For SNe Ia in general, the environment at the interstellar scale appears to
be responsible for the non-standard extinction law. Furthermore, deeper limits
can be obtained using the standard nature of SN Ia NIR light curves. In this
application, an upper limit of Mdot ~10^{-8}-10^{-7} Msun/yr (for the wind
velocity of ~10 km/s) is obtained for a mass loss rate from a progenitor up to
~0.01 pc, and Mdot ~10^{-7}-10^{-6} Msun/yr up to ~0.1 pc.
