Image data processing device and image data processing system

An image data processing system comprising:

• a plurality of imaging devices whose imaging ranges at least partially overlap;
• and
• an image data processing device that processes image data items obtained from the plurality of imaging devices,
• wherein the image data processing device includes
• a processor configured to perform:
• a process of detecting a face of a person in an image indicated by the image data and recognizing a personal attribute of the person on the basis of the detected face for each of the image data items;
• a process of generating map data, in which the recognized personal attribute has been recorded in association with a position of the person in the image indicated by the image data, for each of the image data items;
• a process of interpolating the personal attribute of the person who overlaps between a plurality of the map data items;
• and
• a process of combining the plurality of map data items after the interpolation to generate composite map data, and
• in a case in which information of the personal attribute is not capable of being interpolated with another map data item, the processor interpolates the information with another information item of the personal attribute having a similar change in attribute information over time.