A method for expressing a homeostatic function activating gene, comprising a step of applying a thermal stimulus, which is lower than 50 degrees Celsius, to at least a stimulus application origin part, which is a part between first and second toes of left or right foot sole, and which is located at an intersection of an extended line of a medial edge and a vertical line of the medial malleolus, by using an electric type warm temperature heating stimulus apparatus, thereby increasing a blood volume.