To generate a high-quality mosaic image even in a case where a material image having a shape different from that of a region in which the material image is to be placed is used. When recording data on a recordable disc corresponding to an existing first standard, either one of first and second recording signal processors 9 and 10 can be selectively used, so that data recording in the high density recording mode which allows data generated by the second recording signal processor 10 to be recorded on a recordable disc corresponding to the first standard can be performed. The target has a plurality of interconnecting plates made of recyclable material and is devoid of hazards comprising munitions, fuels, and radioactive materials.