A display apparatus includes a master/slave setting unit configured to execute at least one of setting of a master apparatus which displays a switching-display synchronization signal superposed on an image as a target to be displayed and setting of a slave apparatus which does not display the switching-display synchronization signal, a synchronization-signal superposition unit configured to superpose the switching-display synchronization signal on the image as the target to be displayed, when setting of the master apparatus is executed by the master/slave setting unit, and a display unit configured to display the image on which the switching-display synchronization signal is superposed by the synchronization signal superposition unit.