Disclosed is a scaling process system including a replay apparatus and a video output apparatus which are connected via a HDMI, wherein each of the video output apparatus and the replay apparatus respectively comprises a between-pixel interpolation method table, wherein the video output apparatus including a request signal transmission device to transmit a request signal, a between-pixel interpolation method information receiving device to receive the between-pixel interpolation method information, a determining device to determine which of between-pixel interpolation method information of the replay apparatus or between-pixel interpolation method information of the video output apparatus is more high-performance, a deciding device to decide an apparatus to be used for the scaling process, and a control device to control the apparatus which is decided by the deciding device so as to carry out the scaling process, and wherein the replay apparatus including a request signal receiving device to receive the request signal and a between-pixel interpolation method information return device to return the between-pixel interpolation method information.