A data recording and/or reproducing apparatus having actuating buttons or adjustment volumes which enable a wide variety of processing operations despite a limited operating space, and which is able to display levels of plural audio data or to display various other data on a limited display area without detracting from viewability. To this end, the apparatus recording and/or reproducing includes a unit for recording and/or reproducing data for a non-linear accessible recording medium, at least one input port and at least one output port. The input port and the output port time-divisionally access the recording and/or reproducing unit to process the data inputted to the input port to output the processed data to the recording and/or reproducing a unit. The data reproduced from the recording and/or reproducing unit is processed by and outputted from the output port. The apparatus also includes a port actuation button for selecting the input and output ports, an actuation selection button for selecting recording or playback for the input port or the output port as selected by the port actuation button, and a controller for performing control so that the recording operation or the playback operation as selected by the actuation selection button will be executed by the input port or the output port as selected by the port actuation button.