An information processing system according to one embodiment includes a first specifying unit, a second specifying unit, a generation unit, and an output unit. The first specifying unit specifies one or more first evaluation points of view corresponding to an expression in first information created by a provider of an object based on dictionary data indicating association between an expression and an evaluation point of view. The second specifying unit specifies one or more second evaluation points of view corresponding to the expression in second information created by a reviewer for the object based on the dictionary data. The generation unit generates supplementary information based on a difference in an evaluation degree between the first evaluation point of view and the second evaluation point of view. The output unit outputs the supplementary information.