In order to obtain an image encoding scheme conversion device with which it is possible to achieve recompression with a small amount of calculation and reduce the data amount of an encoded image signal, the present invention is provided with: an encoding type determination unit for determining whether an encoded image signal is intra-screen encoded or inter-screen encoded; an entropy decoding unit for applying an entropy decoding process to the encoded image signal if the same is determined to be an inter-screen encoded image signal, and outputting encoding information for each region into which the entropy-decoded image is divided in prescribed units; a motion determination unit for determining on the basis of the encoding information whether the inter-screen encoded image signal includes motion; an image removal unit for removing an inter-screen encoded image signal that is determined by the motion determination unit to include no motion; an image re-encoding determination unit for determining whether or not to re-encode the encoded image signal if the same is determined by the encoding type determination unit to be an intra-screen encoded image signal; a decoding unit for decoding the intra-screen encoded image signal when it is determined by the image re-encoding determination unit that the intra-screen encoded image is to be re-encoded; and an encoding unit for inter-screen encoding the decoded image signal decoded by the decoding unit.
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