Such a displaying device that can be easily operated by aged persons and
handicapped persons, and an image forming apparatus using the same will
be provided. Upon continuously operating an upper button for the
predetermined period of time, a set value of a magnification is changed
at intervals of numeric change that are different from each other between
a voice guide mode activated by a voice guide button and a normal mode.
At this time, it is configured in such a manner that the interval of
numeric change for the normal mode is smaller than the interval of
numeric change for the voice guide mode, i.e., the changing rate of the
set value of the magnification for the normal mode is larger than that
for the voice guide mode.