1. An information processing device comprising: a processor; and a memory storing instructions to be executed by the processor by causing the processor to execute: a similarity calculation unit configured to calculate first similarities between one input information included in a set of input information indicating features related to input patterns that are objects of a verification and each of a plurality of types of reference information indicating features related to reference patterns that are acquired in a specific condition as references of the verification and to calculate second similarities between another input information included in the set of input information indicating features related to input patterns that are objects of the verification and each of the plurality of types of reference information indicating features related to reference patterns that are acquired in the specific condition as references of the verification; and a similarity determination unit configured to determine first correlations between the pluralities of first similarities relating to one input information and to determine second correlations between the pluralities of second similarities relating to another input information; and a verification determination unit configured to (i) compare determined first correlations and second correlations, (ii) output a result obtained by examining a rate how the first correlations and second correlations are matched, (iii) compare the rate of the result with a predetermined threshold, (iv) determine whether or not each of the set of the input information represents a same image on the basis of the comparison result, and (v) present a verification result as to the determination.