A method includes causing a computer of a communication terminal to perform a process including acquiring, in response to receipt of a beacon signal transmitted from a vending machine, identification information and type information of a plurality of drinks from the vending machine by using short-range wireless communication; acquiring preference information on drinks of a user of the communication terminal; generating, based on the identification information, the type information, and the preference information, a push notification screen that recommends at least one drink that matches a preference of the user indicated by the preference information from among the plurality of drinks stored in the vending machine indicated by the identification information; and displaying the push notification screen on a display of the communication terminal.