A digital signal processing method and apparatus that provide a mechanism for controlling the output of digitally processed data in an optical disc player so as to reduce the probability of error and lost data during such output. In one aspect, an apparatus for processing information on an optical disc comprises a signal processor for processing a digital signal corresponding to an analog signal read from the optical disc to generate output data, a memory unit, operatively associated with the signal processor, for temporarily storing the output data in predetermined units under the control of the signal processor, and an output unit, operatively connected to the signal processor, for processing the output data based on the type of optical disc. The output unit generates a request signal that causes the signal processor to retrieve output data from the memory unit and transmit the retrieved output data to the output unit in parallel. The signal processor activates an acknowledge signal such that output data transmitted to the output unit while the acknowledge signal is activated is deemed valid by the output unit, whereas output data that is transmitted while the acknowledge signal is deasserted is deemed invalid.