Recent technology and experiments have fabricated high-quality superconducting MgB2 nanoparticles. We investigate properties\r\nof two-gap superconductivity in nanosized systems by using a two-sublevel model. In the present work, we analyze the results\r\nobtained for superconducting granules in the case of multiband superconductivity. We discuss the finite size effect in multiband\r\nsuperconductors. A definition of the critical level spacing of two-gap superconductivity is also presented, and we discuss the\r\ncondensation energy and the parity gap of two-gap superconductivity in relation to the size dependence of those properties with\r\ntwo bulk gaps and the effective pair scattering process between two sublevels.
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