According to one embodiment, a frame interpolation device includes a detecting section which receives a frame signal of 60 Hz and outputs a pull-down detection signal when determining that the frame signal is a pull-down signal, a generation section which generates a first frame signal of 120 Hz by use of a first insertion pattern based on the frame signal of 60 Hz and a second frame signal of 120 Hz by use of a second insertion pattern, and a selecting section which outputs the first frame signal by the first insertion pattern when the pull-down detection signal is not received and outputs the second frame signal of 120 Hz of the second insertion pattern when the pull-down detection signal is received.