A method for decoding a message is disclosed. The method is used for an electronic system for displaying messages. The method comprises the following steps: a processing module decoding an un-decoded string of a message received from a message transferring terminal, acquiring a first word group and saving the first word group to a word group handling buffer, and recording a repetition value of the first word group; the processing module decoding an un-decoded string of a message received from the message transferring terminal, acquiring a second word group from the un-decoded string, and saving the second word group to a word group decoding buffer; the processing module comparing the first word group and the second word group to determine whether the first word group and the second word group are the same; and if yes, increasing the repetition value of the first word group.