PERSON AUTHENTICATION SUPPORT SYSTEM, PERSON AUTHENTICATION SUPPORT METHOD, AND NON-TRANSITORY STORAGE MEDIUM

A person authentication support system (100) includes: a measurement condition acquisition unit (112) for acquiring a measurement condition of a depth in a measurement apparatus capable of generating image information indicating an image of a photographing region including a face of a target person, and depth information indicating a depth; a region setting unit (115) for setting a processing region being a region serving as a processing target of the depth information in the photographing region according to the measurement condition; a depth acquisition unit (116) for acquiring depth information including a depth in the processing region being measured in the measurement condition; and a collation determination unit (117) for determining whether image information of the target person is used in collation processing, based on depth information of the processing region.