The present invention discloses a number-assistant voice input system, a number-assistant voice input method for a voice input system and a number-assistant voice correcting method for a voice input system, which apply software to drive a voice input system of an electronic device to provide a voice input logic circuit module. The voice input logic circuit module defines the pronunciation of numbers 1 to 26 as the paths to respectively input letters A to Z in the voice input system and allows users to selectively input or correct a letter by reading a number from 1 to 26 instead of a letter from A to Z.