1. A gender identification method for discriminating whether a human subject of discrimination is male or female, which gender identification method comprises: obtaining infrared face image data on the subject using an image signal from a television camera; using a processing device to perform sampling of the cheek region and jaw region temperatures of the subject based on the infrared face image data; calculating the averages of the temperatures; calculating cheek data/jaw data and a cheek emphasized variance value; mapping the cheek data/jaw data and cheek emphasized variance value on an XY plane; conducting first gender discrimination; conducting second gender discrimination using the cheek data/jaw data and third gender discrimination using the cheek emphasized variance value; and conducting gender identification of the subject in accordance with agreement between two or more of the first to third gender discrimination results.