The present invention similarity information retrieval method capable of selecting a flexible search method in accordance with the user's intention to provide a terminal apparatus and similar information retrieval system.
A similar information retrieval method includes an instruction obtaining step of data processing apparatus 200 acquires an instruction about whether to encrypt search or unencrypted search, generates an encrypted feature quantity, the data processing apparatus 200 a feature quantity transmission step of transmitting, the instruction transmission step of generating and transmitting encrypted similarity value and the similarity value transmission step of transmitting to the data processing apparatus 200, the instruction acquired by the instruction acquisition step to the data processing apparatus 200, and a decoding step of receiving and decoding the encrypted reference data from the data processing apparatus 200. Encryption method, when performing encryption search is a homomorphism and the encryption method that can not be decoded in the data processing apparatus 200, when performing an unencrypted search ciphers can be decoded by the data processing apparatus 200 it is a scheme.
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