Provided is a device which obtains information for verifying onset of dementia while suppressing individual differences between subjects. The device includes a stimulus provision unit 12 which provides a subject H with one of two alternatively selectable selection items as a stimulus including at least one of audio information and visual information a plurality of times, a measurement unit 13 which measures a response time from the provision of the stimulus to the reception of the responses from the subject H, an average time computation unit 14 which calculates an average value of the response times, and a data creation unit 17 which creates data in which the average value of the response times for the specified subject H is compared with the previously prepared average value of the response times.