An apparatus for detecting labeled beads is provided. A parallel data generator 18 provides first data having four or five effective data width according to a divided clock DCLK. In the magneto-optical disk apparatus with which a change to a function is open to a user, the received data is deciphered by a 1394 interface. The digital image is rendered based upon the variables of the multi-dimensional digital differential analyzer. A second liquid is located inside of the capillaries.