An information processing device 1C mainly includes an acquisition unit 30C and a determination unit 32C. The acquisition unit 30C acquires at least one of purchase record information indicative of a purchase record or the individual attribute information relating to an attribute of a customer who is a subject of mobile sales of a commodity, and presence information relating to a presence of the customer, the purchase record including a date and time of a purchase by the customer. The determination unit 32C determines, based on at least one of the purchase record information or the individual attribute information and the presence information, a timing of moving sales of a recommended commodity to be recommended to the customer.