Provided is a review system with which it is easy for a user to determine whether or not a typographical error or the like has been made. Specifically provided is a review system that divides sentences included in a group of comparison documents into a plurality of first words, and performs review using a group of comparison images obtained by imaging the first words. Specifically, first, the review system divides sentences included in a specified document into a plurality of second words, and acquires the frequencies of occurrence of the plurality of second words in the group of comparison documents. Next, the review system acquires a verification image by imaging a second word among the plurality of second words that has a frequency of occurrence equal to or less than a threshold value. The review system then obtains the degrees of similarity between the verification image and the comparison images included in the group of comparison images, and presents the first word represented by the comparison image having at least the highest degree of similarity among the comparison images. The presentation is made, for example, by indicating that there is a possibility that the second word represented by the verification image may be a typographical error for the first word represented by a comparison image having a high degree of similarity to the verification image.
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