It is well-established that Type Ia supernova (SN Ia) luminosities are correlated with their host properties. Understanding and correcting this relation, therefore, would provide a more accurate result for the SN cosmology. However, the origin of the relation is still under debate. In order to investigate the origin of the relation, here we present an on-going effort studying with the recent ZTF SNe Ia data. First, we introduce a host identification method-the directional light radius method-, which considers a (elliptical) size of a galaxy. Then, we measure host properties, such as stellar mass and global star formation rate (SFR), by using LePHARE with BC03 templates and GALEX+SDSS photometry. We show that a distribution of host galaxies in the mass-SFR plane is similar to that of other galaxies. In the near future, we will compare light-curve parameters of ZTF SNe Ia with host galaxy properties to discuss the origin of the relation between SNe Ia and their host galaxies.