A mobile terminal reads a read manuscript as image data. A character recognition
block performs character recognition from the image data, which is read, on the
basis of a threshold for judgement of unrecognizableness. A character recognition
result is transmitted to a central control unit, or the threshold for judgement
of unrecognizableness is received from the central control unit in a threshold
receiver. On the other hand, the central control unit receives the result of character
recognition from the mobile terminal, or transmits the threshold for judgement
of unrecognizableness from a threshold transmitter to the mobile terminal. Furthermore,
the central control unit controls the threshold for judgement of unrecognizableness
with a threshold controller.
