The present invention relates to a signal processing device and a video display device having same. A signal processing device according to one embodiment of the present invention comprises: a decoder for decoding first video data from a first video source and second video data from a second video source to output decoded first video data and decoded second video data; a video quality processing unit for, when a common frame rate is set on the basis of a first frame rate of the first video data and a second frame rate of the second video data, outputting the first video data on the basis of the common frame rate; and a graphic processing unit for outputting the second video data on the basis of the common frame rate. Thereby, it is possible to process a plurality of video data in synchronization.