An information processor includes: a display configured to display a symbol display area on which symbols are displayable; and a controller programmed to execute the processes of: (1a) randomly determining symbols to be displayed outside a symbol display area; (1b) displaying, outside the symbol display area, the symbols determined in the process (1a); (1c) randomly determining a combination of symbols to be displayed in the symbol display area; (1d) displaying, in the symbol display area, the combination of the symbols determined in the process (1c); (1e) when a predetermined condition is satisfied, displaying a predetermined number of symbols out of the symbols displayed outside the symbol display area in the process (1b) in the symbol display area, in accordance with the satisfied predetermined condition; and (1f) after the process (1e), awarding a benefit in accordance with a combination of the symbols displayed in the symbol display area.