A method for reducing memory consumption when carrying out edge enhancement in a multiple beam pixel apparatus is provided, wherein Static Random Access Memories and first in first out buffers are employed. When the first to the n.sup.th input units read the next bit data, the first rows of the bit data in the first to the n.sup.th buffers are removed, and each row of bit data behind the first rows is moved towards left by one bit. The first rows of bit data in the (n+1).sup.th to the (n+4).sup.th buffers are stored in one end of the first to the fourth memories respectively, and a bit data is taken out from the other end of each of the memories, to be sequentially stored in the end of the first to the fourth buffers, and the read next bit data is stored in the fifth to the (n+4).sup.th buffers.