An information signal processing apparatus comprises: data playback unit for playing back data from a recording medium on which featured data is recorded according to the setting of a first parameter series; information file playback unit for playing back the video/audio information files by selecting from the recording medium; parameter setting unit for selecting one of the played back information files and setting parameter data corresponding to the information file and to the first or second parameter series; playback period processing unit for determining the playback period of the video/audio data recorded on the recording medium according to the featured data and either initialization parameter data set in advance in accordance with the first and second parameter series or the parameter data adjusted by the parameter setting unit; and playback control unit for performing playback control according to the signal from the playback period processing unit.