An apparatus and a method for determining blood sugar based on heterogeneous spectrums are provided. The blood sugar model generation apparatus includes a data obtainer (710) configured to obtain blood sugar profile data of a user based on a first type spectrum-blood sugar profile relationship model, a second type spectrum measurer (720) configured to measure training second type spectrum data for the skin of the user, and a processor (730) configured to generate an individualized blood sugar model based on the obtained blood sugar profile data and the measured training second type spectrum data.
