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We present the deep homogeneous $UBVRI$ photometric data of 135,071 starsdown to $V\sim23$ mag and I ~ 22 mag toward the Carina Nebula. These stars arecross-matched with those from the previous surveys in the X-ray, near-infrared,and mid-infrared wavelengths as well as the Gaia Early Data Release 3 (EDR3).This master catalog allows us to select reliable members and determine thefundamental parameters distance, size, stellar density of stellar clusters inthis star-forming region. We revisit the reddening toward the nebula using theoptical and the near-infrared colors of early-type stars. The foregroundreddening [E(B-V)_fg] is determined to be 0.35+/-0.02, and it seems to followthe standard reddening law. On the other hand, the total-to-selectiveextinction ratio of the intracluster medium (R_V,cl) decreases from the centralregion (Trumpler 14 and 16, R_V,cl ~ 4.5) to the northern region (Trumpler 15,R_V,cl ~ 3.4). It implies that the central region is more dusty than thenorthern region. We find that the distance modulus of the Carina Nebula to be11.9+/-0.3 mag (d = 2.4+/-0.35 kpc) using a zero-age main-sequence fittingmethod, which is in good agreement with that derived from the Gaia EDR3parallaxes. We also present the catalog of 3,331 pre-main-sequence (PMS)members and 14,974 PMS candidates down to V ~ 22 mag based onspectrophotometric properties of young stars at infrared, optical, and X-raywavelengths. From the spatial distribution of PMS members and PMS candidates,we confirm that the member selection is very reliable down to faint stars. Ourdata will have a legacy value for follow-up studies with different scientificpurposes.

A deep optical survey of young stars in the Carina Nebula. I. -- UBVRI photometric data and fundamental parameters