In a vehicle, positional information of the vehicle and status determination information are serially acquired. Each time a user speaks a speech, speech data is acquired. A storage section stores the acquired speech data, and the positional information and status determination information acquired when the speech data is acquired, in association in a memory, as stored speech data, stored positional information, and stored status determination information. For each stored speech data in the memory, a determination is made whether a first status indicated by the stored positional information and stored status determination information associated with the stored speech data is similar to a second status indicated by the positional information and status determination information newly acquired at a current time. A reporting processor reports, to a driver, information based on the stored speech data when the determination is affirmed.