1. An image processing device comprising: a processor; and a memory which stores a plurality of instructions, which when executed by the processor, cause the processor to execute: acquiring an image which includes a first region and a second region of a user; detecting, from a group of candidate areas for the first region and the second region included in the image, the candidate area corresponding to the first region based on biometric characteristics of the first region; determining a connection direction between the first region and the second region based on outer edges of the candidate area corresponding to the first region; and selecting the candidate area corresponding to the second region from the group of candidate areas based on the connection direction.