1. An information processing system, comprising: a display; a processor; and a memory device that stores a plurality of instructions, wherein when the processor executes the instructions in the memory device, the processor is operable to: cause the display to show, a first screen relating to a list of selection candidates, the first screen being a screen on which a plurality of the same or similar selection candidates are aggregated into one representative selection candidate; set, as a display object to be displayed on a second screen that is displayed when a user selects the representative selection candidate, any one of the plurality of selection candidates that are aggregated into the representative selection candidate based on information on at least two selection candidates among the plurality of selection candidates; and cause the display to show, when the user selects the representative selection candidate, the second screen relating to the one of the plurality of selection candidates set as the display object, wherein the processor is operable to: set probability information indicating probabilities of each of the plurality of selection candidates that are aggregated into the representative selection candidate to be determined as the display object based on the information on the at least two selection candidates among the plurality of selection candidates; and determine, as the display object, any one of the plurality of selection candidates that are aggregated into the representative selection candidate based on the probability information.