1. A person-based digital photo clustering method, comprising: detecting a face area from photo data; extracting content-based face feature value information from the detected face area; obtaining person-based photo clustering hint information; and performing, through controlling at least one processor, person-based clustering by applying the person-based photo clustering hint information to the extracted content-based face feature value information, wherein the performing of person-based clustering comprises: performing clustering based on a situation in which a photo is taken, based on the extracted content-based face feature value information, to obtain a situation-based cluster; and performing person-based clustering in the situation-based cluster, by applying the person-based photo clustering hint information to the extracted content-based face feature value information.