1. A feature point input assisting device comprising: a memory storing instructions; and a processor configured to execute the instructions to: receive a manual input operation for setting a first feature point in an input image including a fingerprint image; extract, based on the first feature point, a second feature point from the input image; extract, based on a determination that the first feature point and the second feature point are not a pair, the second feature point as an input omission feature point candidate; and display the input omission feature point candidate on the input image.