Returning to FIG. 2, the output unit 20 outputs information regarding the person extracted by the person extraction unit 10. The output unit is not particularly limited, and is implemented through all output apparatuses, such as a display, a printer, and a mailer. An example of the output of the output unit 20 is the same as that in the first to fourth example embodiments.

The output unit 20 may output information indicating at least one of: the place where each of the plurality of persons extracted by the person extraction unit 10 appeared; and the number of places where the person appeared. For example, as shown in FIG. 14, a face image of the person and the person's presence or absence of appearance in each of the plurality of pieces of child data may be shown in association with each of the plurality of persons extracted by the person extraction unit 10. In the illustrated example, as information for identifying each piece of child data, information for identifying the place where each piece of child data was captured is displayed.

It should be noted that the person extraction unit 10 of the present example embodiment may execute processing according to the configuration of the person extraction unit 10 of the second example embodiment.

Next, an example of the processing flow of the data processing apparatus 1 will be described with reference to the flowchart shown in FIG. 15.