An information acquiring method to acquire brain activity information from biological subjects presented a sensory stimulus, including the following processes,(1) a process to present the sensory stimulus to at least one brain area of the biological subjects including the visual cortices of the cerebral cortex, the auditory cortices of the cerebral cortex, and the vestibular cortices of the cerebral cortex,(2) a process to measure brain activity in multiple, different regions of the brain areas while the sensory stimulus is presented, and(3) a process to evaluate stress provided to the subject by the sensory stimulus based on the brain activity data for the multiple regions.
