4. The speech recognition apparatus according to claim 1 , wherein: the detection device detects a character string having a maximum number of letters that coincide with the correction character string, the input of which is received by the reception device, as the misrecognition character string in the correction range; and the correction device executes the correction by replacing the misrecognition character string detected by the detection device with the correction character string relating to detection of the misrecognition character string.
4. The speech recognition apparatus according to claim 1 , wherein: the detection device detects a character string having a maximum number of letters that coincide with the correction character string, the input of which is received by the reception device, as the misrecognition character string in the correction range; and the correction device executes the correction by replacing the misrecognition character string detected by the detection device with the correction character string relating to detection of the misrecognition character string. 5. The speech recognition apparatus according to claim 4 , further comprising: a retrieving device that defines a letter number, which is determined by a number of letters included in the correction character string, as a correction letter number, and retrieves all of character strings having the correction letter number in the correction range, wherein: the detection device detects one of the character strings retrieved by the retrieving device, which has a maximum number of letters that coincide with the correction character string, as the misrecognition character string.