An encrypted text matching system includes: an auxiliary data generating unit that generates first and second auxiliary data, which are for verification of matching between a first encrypted text that is obtained by encrypting at least one of a plurality of data segments into which input data is divided by segmenting unit and that is registered with a storage device and a second encrypted text that is obtained by encrypting at least one of a plurality of data segments into which input data to be matched is divided by segmenting unit, the verification being performed by using a Hamming distance between plaintexts; and a matching determining unit that takes a difference between the first and second encrypted text, and determines whether a Hamming distance between plaintexts that corresponds to the difference between the first and second encrypted text is equal to or less than a predetermined certain value.