DECOLORIZING DEVICE, SHEET DECOLORIZING METHOD, AND RECORDING MEDIUM FOR RECORDING DECOLORIZING PROCESS PROGRAM

A decolorizing device includes a first reading section, a decolorizing section, a second reading section and a controller. The first reading section reads a first side of the sheet. The decolorizing section performs a decolorizing process on the sheet and the second reading section reads the first side of the sheet. The controller is configured to determine if the decolorizing process is necessary or not on the first side based on first image data of the first side read by the first reading section, to read the first side of the sheet having been subjected to the decolorizing process at the decolorizing section by the second reading section if it is determined that the decolorizing process is necessary, and to avoid reading of the first side of the sheet by the second reading section if it is determined that the decolorizing process is unnecessary.