PURPOSE: To provide the display method of the arbitrary waveform generator which clearly and easily grasps the process of a series of signal processes, the functions of respective process blocks, or data, etc., when a required signal is generated.

CONSTITUTION: The optional waveform generator stores a display memory with block display data of a waveform amplifying process, a modulating process, a filter process, an attenuating process, or an offset process, etc., corresponding to setting data that an operator selects (52), displays a series of processes such as the waveform data, amplifying process, modulating process, and filter process selected with the setting data on a display means as a block diagram shown in a time series (54, and displays the functions or data, etc., of the respective blocks in the peripheral areas of the respective blocks with characters, numerals, symbols, or figures (56).