An arousal support system includes: a dialogue processing unit configured to output a dialogue speech in a form of a question, and obtain response speech which is a response of a driver to the dialogue speech; a response time measuring unit configured to measure a response time from the dialogue processing unit outputs the dialogue speech till the dialogue processing unit obtains the response speech; a database storing the response time measured by the response time measuring unit; a statistic calculating unit configured to calculate a statistical value of the response time based on one or more response times stored in the database; and a first estimating unit configured to derive, based on the response time measured by the response time measuring unit and the statistical value calculated by the statistic calculating unit, an estimated value of wakefulness of the driver.
Arousal support system and arousal support method