A frame rate converting apparatus for converting a frame rate of an input first image signal and outputting the image signal having the converted frame rate as a second image signal. The apparatus includes an input section into which the first image signal is input; a detecting section for detecting a time difference between synchronization timing of each frame of the first image signal and synchronization timing of each frame of the second image signal; a section for determining an output method of outputting the first image signal in conformity with a frame rate of the second image signal, based on a time period of each frame of the first image signal, a time period of each frame of the second image signal, and the above time difference; and an output section for outputting the first image signal as the second image signal in accordance with the determined output method.