4. The identifying method of hand-written Latin letter, as recited in claim 1 , wherein step (d) comprises steps of: (d.1) determining whether the inputted hand-written Latin letter is up-down structure, wherein if the inputted hand-written Latin letter is up-down structure, determine whether the last stroke is transverse or not, wherein if the last stroke is transverse, directly determine that the coarse classification candidate letter aggregation matched with the inputted hand-written Latin letter is the transverse stroke coarse classification candidate letter aggregation; if the last stroke is not transverse, directly determine that the coarse classification candidate letter aggregation matched with the inputted hand-written Latin letter is the non-transverse stroke coarse classification candidate letter aggregation; if the inputted hand-written Latin letter is not up-down structure, carry out the following step; (d.2) calculating the transverse cross number H, wherein when the transverse cross number is 1, calculate the vertical cross number, and determine the coarse classification candidate letter aggregation that matched with inputted hand-written Latin letter is the coarse classification candidate letter aggregation with S=1, S=2, S=3 or S=4 according to different vertical cross number; when the transverse cross number is 2, calculate the transverse cross number UP in the ⅓ upper portion of the Latin letter, wherein when the transverse cross number in the ⅓ upper portion of the Latin letter is 2 or 3, directly determine that the coarse classification candidate letter aggregation matched with the inputted hand-written Latin letter is the coarse classification candidate letter aggregation with UP=2 or UP=3; when the transverse cross number in the ⅓ upper portion of the Latin letter is 1, calculate the vertical cross number of the hand-written Latin letter, and determine the coarse classification candidate letter aggregation that matched with inputted hand-written Latin letter according to the vertical cross number and the position information of the last new chirography coordinate point of the new chirography coordinate lattice in the standard Latin letter during the hand writing, and whether the left arch opening of the inputted Latin letter existing or not; when H=3, calculate the optimal vertical cross number of the inputted Latin letter, wherein when the optimal vertical cross number is 2 or 3, directly determine that the coarse classification candidate letter aggregation that matched with inputted hand-written Latin letter is the coarse classification candidate letter aggregation with Maxs=2 or Maxs=3; when the optimal vertical cross number is 1, determine the coarse classification candidate letter aggregation that matched with inputted hand-written Latin letter according to the position information of the last new chirography coordinate point of the new chirography coordinate lattice in the standard Latin letter during the hand writing, and whether the left arch opening of the inputted Latin letter existing or not; when H=4, calculate the transverse cross number Down in the ⅓ lower portion of the Latin letter, wherein when the transverse cross number in the ⅓ lower portion of the Latin letter is 2 or 3, directly determine that the coarse classification candidate letter aggregation matched with the inputted hand-written Latin letter is the coarse classification candidate letter aggregation with Down=2 or Down=3; when the transverse cross number in the ⅓ lower portion of the Latin letter is 1, calculate the vertical cross number of the hand-written Latin letter, and determine the coarse classification candidate letter aggregation that matched with inputted hand-written Latin letter according to the vertical cross number and the position information of the last new chirography coordinate point of the new chirography coordinate lattice in the standard Latin letter during the hand writing, and whether the left arch opening of the inputted Latin letter existing or not.
4. The identifying method of hand-written Latin letter, as recited in claim 1 , wherein step (d) comprises steps of: (d.1) determining whether the inputted hand-written Latin letter is up-down structure, wherein if the inputted hand-written Latin letter is up-down structure, determine whether the last stroke is transverse or not, wherein if the last stroke is transverse, directly determine that the coarse classification candidate letter aggregation matched with the inputted hand-written Latin letter is the transverse stroke coarse classification candidate letter aggregation; if the last stroke is not transverse, directly determine that the coarse classification candidate letter aggregation matched with the inputted hand-written Latin letter is the non-transverse stroke coarse classification candidate letter aggregation; if the inputted hand-written Latin letter is not up-down structure, carry out the following step; (d.2) calculating the transverse cross number H, wherein when the transverse cross number is 1, calculate the vertical cross number, and determine the coarse classification candidate letter aggregation that matched with inputted hand-written Latin letter is the coarse classification candidate letter aggregation with S=1, S=2, S=3 or S=4 according to different vertical cross number; when the transverse cross number is 2, calculate the transverse cross number UP in the ⅓ upper portion of the Latin letter, wherein when the transverse cross number in the ⅓ upper portion of the Latin letter is 2 or 3, directly determine that the coarse classification candidate letter aggregation matched with the inputted hand-written Latin letter is the coarse classification candidate letter aggregation with UP=2 or UP=3; when the transverse cross number in the ⅓ upper portion of the Latin letter is 1, calculate the vertical cross number of the hand-written Latin letter, and determine the coarse classification candidate letter aggregation that matched with inputted hand-written Latin letter according to the vertical cross number and the position information of the last new chirography coordinate point of the new chirography coordinate lattice in the standard Latin letter during the hand writing, and whether the left arch opening of the inputted Latin letter existing or not; when H=3, calculate the optimal vertical cross number of the inputted Latin letter, wherein when the optimal vertical cross number is 2 or 3, directly determine that the coarse classification candidate letter aggregation that matched with inputted hand-written Latin letter is the coarse classification candidate letter aggregation with Maxs=2 or Maxs=3; when the optimal vertical cross number is 1, determine the coarse classification candidate letter aggregation that matched with inputted hand-written Latin letter according to the position information of the last new chirography coordinate point of the new chirography coordinate lattice in the standard Latin letter during the hand writing, and whether the left arch opening of the inputted Latin letter existing or not; when H=4, calculate the transverse cross number Down in the ⅓ lower portion of the Latin letter, wherein when the transverse cross number in the ⅓ lower portion of the Latin letter is 2 or 3, directly determine that the coarse classification candidate letter aggregation matched with the inputted hand-written Latin letter is the coarse classification candidate letter aggregation with Down=2 or Down=3; when the transverse cross number in the ⅓ lower portion of the Latin letter is 1, calculate the vertical cross number of the hand-written Latin letter, and determine the coarse classification candidate letter aggregation that matched with inputted hand-written Latin letter according to the vertical cross number and the position information of the last new chirography coordinate point of the new chirography coordinate lattice in the standard Latin letter during the hand writing, and whether the left arch opening of the inputted Latin letter existing or not. 5. The identifying method of hand-written Latin letter, as recited in claim 4 , wherein step (d.1) comprises the following steps of (d.1.1) scanning the new chirography coordinate lattice row by row from top to bottom, wherein when meet with the first new chirography coordinate point, set the row value to the current row under scanning, and define the row value as the top boundary of the letter, and scanning the new chirography coordinate lattice row by row from bottom to top, wherein when meet with the first new chirography coordinate point, set the row value to the current row under scanning, and define the row value as the bottom boundary of the letter; (d.1.2) scanning from the top boundary to the bottom boundary, record the number of the blank row where there is not new chirography coordinate point during the scanning, wherein when the number of the blank row equals to or is larger than 3 and next row of the last blank row of continuous blank rows is not blank, determine the inputted Latin latter is up-down structure.