An autism diagnosis support method and system, and device capable of providing support to early detection and early definite diagnosis on the basis of objective evaluation, are provided by using a conventionally proposed “eye-gaze detection technique”. The method includes: displaying, on a screen of the display portion, a combination image for sequentially displaying at least two images including a predetermined human image (I) and a predetermined non-human image (II)； and evaluating an eye-gaze position of the subject by detecting eye-gaze position information on the subject looking at the combination image in use of the eye-gaze detecting unit, then inputting the eye-gaze position information on the subject in an eye-gaze position information storing portion, and comparing, based on an eye-gaze position evaluation algorithm, the eye-gaze position information on the subject with eye-gaze position information on an individual with autism and/or a typically developing individual.
