1. An image compressing apparatus having a processor that compresses an image including a plurality of pixels to generate a compressed file, comprising: a file format receiving section that receives selection of a file format of the compressed file; a compression ratio receiving section that receives selection of a compression ratio which is set with respect to the image and represents data size when compressing the image; and a black text selection receiving section that receives selection of whether or not a pixel constituting an edge of a black text is extracted from the image during the time of generation of the compressed file of the image, wherein, when the file format receiving section receives a file format that allows separation of image data into a plurality of layers and the compression ratio receiving section receives selection of high compression ratio among a plurality of compression ratios, the black text selection receiving section can receive selection of whether or not the pixel constituting the edge of the black text is extracted from the image while said processor compresses each of the layers using an appropriate method and composes the compressed image data items into one file.