An information processing method enhancing running efficiency of a passenger transportation vehicle is provided. The information processing method includes acquiring first stop position information indicating a first desired stop position of a first user riding a vehicle and tolerable range information indicating a gap range from the first desired stop position, which the first user tolerates, acquiring second stop position information indicating a second desired stop position of a second user riding the vehicle, deciding the second route based on the first stop position information, tolerable range information, and second stop position information, transmitting an inquiry of whether the second route is approved to an apparatus controlled by the first user, or assigning a benefit or the cost to the first user in a case of receiving a response indicating that the second route is approved or not approved from the apparatus.