The present invention accomplishes a screen image display apparatus capable of changing a transfer direction of screen image signal freely. A master control 1 has a plurality of channels, with a signal line 2 being connected for transmitting a screen image signal so as to let each of the channels display a character or image. The signal line 2 is connected to a plurality of display blocks 3 by way of board-A, that is, signal transfer means. Each display block 3 comprises a board-A 4, that is, signal transfer means, a board-B 5, that is, signal supply means, and lamp units 6, that is, light emitting modules. And a screen image signal for causing the display block 3 to display a character or image is transferred from each channel of the master control 1 in a data transfer direction 7 via the signal line 2.