Provided is an information processing device, including: a processor, wherein the processor is configured to: display a plurality of first indices of a database stored in a storage unit, in a first direction of a display area of a display unit; display, upon detecting a user's selection operation for a first index, a plurality of second indices, corresponding to the first index, in a straight line in a second direction intersecting or parallel to the first index; and determine that a second index is selected in a case in which it is detected that a second index display area displaying the second index has been selected, and also in a case in which it is detected that a selection area set other than the second index display area has been selected.