Provided is a data collection method, comprising: comparing a near-infrared fluorescence intensity distribution image, obtained by emitting an indocyanine green excitation light on a target organ in a living body administered with indocyanine green, with a cancer lesion distribution image, obtained by employing x-ray, nuclear magnetic resonance or ultrasound on the target organ before administering the indocyanine green and collecting data on areas, being detected by the near-infrared fluorescence intensity distribution image but undetected by the cancer lesion distribution image, as accessory cancer lesion area data.
