Information processing system and information processing method

An information processing system comprising:

• a first information terminal;
• and
• a second information terminal being independent from the first information terminal and being capable of communicating with the first information terminal,
• the second information terminal practicing a predetermined process on plural pieces of processing target information transmitted from the first information terminal,
• the first information terminal acquiring processing result information being a result of the predetermined process, wherein
• the information processing system comprises:
• a first encrypted information generation unit that is provided to the first information terminal and that generates first encrypted information as information resulting from encryption of each of the plural pieces of processing target information;
• a second encrypted information generation unit that is provided to the second information terminal and that generates second encrypted information as information which results from practicing the predetermined process on plural pieces of the first encrypted information without decrypting the plural pieces of the first encrypted information;
• and
• a decryption processing unit that is provided to the first information terminal, decrypts the second encrypted information, and acquires the processing result information.