Abstract: Disclosed herein an artificial intelligence (AI) server for de-identifying a face area of an unspecific person from an image file including a communicator configured to receive a first image file from an AI apparatus of a user, and a processor configured to acquire first face information included in the first image file and second face information included in a second image file associated with the user, using a face recognition model for determining a face of a person included in the image file, determine unspecific face information, which is not included in the second face information, of the first face information as a person unknown by the user, by comparing the first face information with the second face information, and de-identify an image area of the unspecific face information determined as the unknown person from the first image file.