A method of processing a received message includes: receiving a message through a receiving terminal to obtain the received message; for each bit in the received message, determining a bit state of the bit according to a bit value of the bit; selectively changing the bit state of each bit according to at least a weighting vector and a current value of a flipping threshold, wherein the bit state has a plurality of change ranges; selectively flipping the bit according to the bit state; and adjusting the current value of the flipping threshold according to a number of times the bit has been flipped within a period of time, whether when the number of times the bit has been flipped within the period of time exceeds an upper limit, the flipping threshold adjustment unit increases the current value of the flipping threshold.