1. A focus-point selection system that selects a subset of focus points corresponding to the location of a target in an image capturing area from a plurality of focus points positioned at predetermined locations in the image capturing area, the target being a subject that is brought into focus according to a phase-difference autofocus method, the focus-point selection system comprising: an image sensor that captures an optical image of the image capturing area and generates an image signal corresponding to the captured optical image; a target detector that detects the target on the basis of the image signal; a location detector that detects a subject location, the subject location being a location of the target detected by the target detector in the image capturing area; and a first selector that selects the focus point with the shortest distance from the subject location.