Abstract: A method executed by a computer, including: executing multiple times a first process of outputting question information to a user and acquiring response information from the user; executing a second process at least once while executing the first process multiple times; executing a third process of estimating a vehicle use and customer value for the user and specifying one or more tire products to recommend to the user based on two or more pieces of the response information acquired; and outputting information indicating the vehicle use and the customer value estimated and information regarding the one or more tire products specified. The second process includes determining a comprehension level of the user regarding a tire product, based on one or more pieces of the response information acquired, and determining question information to be output next time and thereafter, according to the comprehension level determined.