1. A deinteracing apparatus, comprising: a spatial interpolator for yielding an intra-field interpolation pixel value with inputs of a pixel value of field data of a region presently interpolated and intra-field perimeter pixel value from the first field data; a temporal interpolator for yielding a field average value about a field picture to be interpolated by averaging a pixel value of the former field and a pixel value of the after field; a motion determining unit for yielding a motion degree value by yielding and comparing the BD and BPPD of the first field data; a motion expander for diffusing the motion degree yielded on the motion determining unit to the horizontal direction and vertical direction perimeter pixels hierarchically; a soft switch for outputting an interpolation value by computing the interpolation pixel value yielded from the spatial interpolator and field average value yielded from the temporal interpolator in accordance with the motion degree value of the motion expander; and a vertical line converter for converting the number of vertical lines of the present field data so as to be appropriate to display by referring the computed interpolation value and the first field data value.