17-11. The data processing method described in 17-9 or 17-10, in which the output step includes outputting an appearance frequency in the moving image data to be analyzed as information regarding the extracted person in the output step.

17-12. The data processing method described in any one of 17-9 to 17-11, in which the output step includes displaying information regarding each of a plurality of extracted persons as a list in descending order of appearance frequency.

17-13. The data processing method described in any one of 17-9 to 17-12, in which the moving image data to be analyzed includes moving image data captured at the same place over a predetermined time period, and

the output step includes outputting information indicating a temporal change in appearance frequency as information regarding the extracted person.

17-14. The data processing method described in any one of 17-9 to 17-12, in which the moving image data to be analyzed includes a plurality of pieces of child data captured at a plurality of places different from each other, and

the output step includes outputting information indicating at least one of a place where the person has appeared and the number of places where the person has appeared as information regarding the extracted person.

17-15. The data processing method described in any one of 17-2 to 17-14, in which the person extraction step includes executing processing to determine whether a person detected in a frame to be processed is similar to a person detected in a previously processed frame in outer appearance feature values, and

the computer further executes a step of receiving a user input to set the predetermined level in the processing.