from the common base layer generation circuit 16 to reconstruct an image with high time resolution from the data of the time scalability enhancement layer on the basis of the output from the selection and rastering circuit 34 which corresponds to the output from the time scalability enhancement layer generation circuit 18 of the encoding apparatus in fig3 a video selection device 46 selects the video signal output from the spatial enhancement layer reconstruction circuit 38 the video signal from the time enhancement layer reconstruction circuit 40 the video signal output from the common base layer reconstruction circuit 36 or the video signal output from the selection and rastering circuit 34 as described above when scalability is used the video selection device 46 can select an image signal with low time spatial resolution an image signal with high time resolution or an image signal with high spatial resolution the operation of the decoding apparatus in fig7 will be described a transmitted recorded reproduced bit stream is input to the decoding apparatus 30 the header information of this bit stream is supplied to the control information detection circuit 32 the control information detection circuit 32 decodes the encoding condition from the header information and supplies a control signal corresponding to the.