4. The translation support apparatus according to claim 1 , further comprising an ID assignment unit configured to assign an identifier for identification to each of the first original sentence partial expression, the first original sentence dummy head, the first translated partial expression, and the first translated sentence dummy head, wherein the first original sentence partial expression, the first original sentence dummy head, the first translated partial expression, and the first translated sentence dummy head are associated with one another using the identifier; and the original sentence replacement unit and the translated sentence replacement unit perform the replacement based on the identifier.
4. The translation support apparatus according to claim 1 , further comprising an ID assignment unit configured to assign an identifier for identification to each of the first original sentence partial expression, the first original sentence dummy head, the first translated partial expression, and the first translated sentence dummy head, wherein the first original sentence partial expression, the first original sentence dummy head, the first translated partial expression, and the first translated sentence dummy head are associated with one another using the identifier; and the original sentence replacement unit and the translated sentence replacement unit perform the replacement based on the identifier. 5. The translation support apparatus according to claim 4 , further comprising a counter unit configured to increment a count value each time an original sentence partial expression is specified, wherein the ID assignment unit generates the identifier based on the count value of the counter unit.