4. A translation requesting terminal comprising: a communications interface for communicating with a translation server via a network; a replacement rule database storing in advance a minimal semantic unit phrase having a specific property and a substitute phrase having the specific property in association with each other; a first replacing means for replacing the minimal semantic unit phrase in an original text with the substitute phrase stored in association with the minimal semantic unit phrase in the replacement rule database; a translation requesting means for sending the original text, which has been subjected to replacement by the first replacing means, to the translation server via the communications interface; a replacement table updating means for storing in a replacement table a translation of the minimal semantic unit phrase and a translation of the substitute phrase in association with each other; a searching means for searching for the translation of the substitute phrase in the translated text; and a second replacing means for replacing, on the condition that a translation text of the original text sent by the translation requesting means is received from the translation server, the translation of the substitute phrase in the translation text with the translation of the minimal semantic unit phrase which is stored in the replacement table in association with the translation of the substitute phrase, wherein the translation of the substitute phrase stored in the replacement table updating means is visually different from the substitute phrase.
4. A translation requesting terminal comprising: a communications interface for communicating with a translation server via a network; a replacement rule database storing in advance a minimal semantic unit phrase having a specific property and a substitute phrase having the specific property in association with each other; a first replacing means for replacing the minimal semantic unit phrase in an original text with the substitute phrase stored in association with the minimal semantic unit phrase in the replacement rule database; a translation requesting means for sending the original text, which has been subjected to replacement by the first replacing means, to the translation server via the communications interface; a replacement table updating means for storing in a replacement table a translation of the minimal semantic unit phrase and a translation of the substitute phrase in association with each other; a searching means for searching for the translation of the substitute phrase in the translated text; and a second replacing means for replacing, on the condition that a translation text of the original text sent by the translation requesting means is received from the translation server, the translation of the substitute phrase in the translation text with the translation of the minimal semantic unit phrase which is stored in the replacement table in association with the translation of the substitute phrase, wherein the translation of the substitute phrase stored in the replacement table updating means is visually different from the substitute phrase. 6. The translation requesting terminal according to claim 4 , wherein the replacement rule base stores a plurality of substitute phrases in association with the minimal semantic unit phrase, and the first replacing means randomly selects one of the plurality of substitute phrases and replaces the minimal semantic unit phrase with the selected substitute phrase.