15. An information processing system comprising: an information processing apparatus and a computer connected to the information processing apparatus through a network, the information processing apparatus comprising a first Japanese-language converting portion that uses a first normal dictionary and first dictionary additional information to convert characters input through user operation and a controlling portion that performs control of transmitting the first normal dictionary to the computer through the network and control of externally receiving the first dictionary additional information as the response thereto, the computer comprising a second Japanese-language converting portion that uses a second normal dictionary and a second dictionary additional information to convert characters input through user operation, a dictionary additional information generating portion that uses the first normal dictionary and the second dictionary additional information to generate the first dictionary additional information for the first normal dictionary received from the information processing apparatus through the network, and a dictionary additional information output portion that outputs the first dictionary additional information generated by the dictionary additional information generating portion.
15. An information processing system comprising: an information processing apparatus and a computer connected to the information processing apparatus through a network, the information processing apparatus comprising a first Japanese-language converting portion that uses a first normal dictionary and first dictionary additional information to convert characters input through user operation and a controlling portion that performs control of transmitting the first normal dictionary to the computer through the network and control of externally receiving the first dictionary additional information as the response thereto, the computer comprising a second Japanese-language converting portion that uses a second normal dictionary and a second dictionary additional information to convert characters input through user operation, a dictionary additional information generating portion that uses the first normal dictionary and the second dictionary additional information to generate the first dictionary additional information for the first normal dictionary received from the information processing apparatus through the network, and a dictionary additional information output portion that outputs the first dictionary additional information generated by the dictionary additional information generating portion. 21. The information processing system as defined in claim 15 , wherein the information processing apparatus and the computer include an encryption/decryption processing portion respectively, wherein the first normal dictionary transmitted/received between the information processing apparatus and the computer is encrypted by the encryption/decryption processing portion of the information processing apparatus, and wherein the encrypted first normal dictionary is decrypted by the encryption/decryption processing portion of the computer.