A video signal synchronization signal generating apparatus for making a display reference synchronization signal Vb that serves as a reference of video display and has a first frequency and an input synchronization signal Vi that constitutes images and has a second frequency synchronized with each other, the apparatus including: a frequency ratio generating section configured to divide a frequency that is double the first frequency by the second frequency to calculate a frequency ratio n; a Vx generation comparator circuit section configured to generate coincidence signal Vx′ having pulses that are inserted by equally dividing one period of the input synchronization signal Vi by the frequency ratio n; and a Vx generation circuit section configured to remove the alternate pulses of the coincidence signal Vx′ to generate synchronization signal Vx of a same phase as the phase of the input synchronization signal Vi.