21. A digital image processing apparatus, said apparatus comprising: an image data unit for providing digital data representing a plurality of digital images including a plurality of persons; a face recognition unit for determining first scores relating to similarity between faces of said plurality of persons; a clothes recognition unit for determining second scores relating to similarity between clothes of said plurality of persons; and a formula selection unit for providing a plurality of formulas to estimate a probability of a face from said faces and a clothes from said clothes to belong to a person from said plurality of persons, wherein at least one formula of said plurality of formulas utilizes a first score and a second score, and at least one formula of said plurality of formulas utilizes only one score of a first score and a second score while one of said first and second scores depends on the other of said first and second scores, and selecting a formula from said plurality of formulas based on availability of a first score from said first scores for two persons from said plurality of persons, and availability of a second score from said second scores for said two persons, said selected formula estimating a probability relating to similarity of identities of said two persons.
21. A digital image processing apparatus, said apparatus comprising: an image data unit for providing digital data representing a plurality of digital images including a plurality of persons; a face recognition unit for determining first scores relating to similarity between faces of said plurality of persons; a clothes recognition unit for determining second scores relating to similarity between clothes of said plurality of persons; and a formula selection unit for providing a plurality of formulas to estimate a probability of a face from said faces and a clothes from said clothes to belong to a person from said plurality of persons, wherein at least one formula of said plurality of formulas utilizes a first score and a second score, and at least one formula of said plurality of formulas utilizes only one score of a first score and a second score while one of said first and second scores depends on the other of said first and second scores, and selecting a formula from said plurality of formulas based on availability of a first score from said first scores for two persons from said plurality of persons, and availability of a second score from said second scores for said two persons, said selected formula estimating a probability relating to similarity of identities of said two persons. 27. The apparatus according to claim 21 , wherein said formula selection unit selects a formula from said plurality of formulas when a first score and a second score for said two persons are available.