1. An image processing apparatus comprising: image inputting means for inputting a first image signal and a second image signal; attribute inputting means for inputting first attribute information representing an attribute of the first image signal and second attribute information representing an attribute of the second image signal, each of the first attribute information and the second attribute information including at least one of a text attribute and an image attribute; image combining means for combining the first image signal and the second image signal in accordance with an image combining ratio for the first image signal and the second image signal to generate a combined image signal; attribute-information combining-ratio determining means for determining an attribute-information combining ratio for the first attribute information and the second attribute information in accordance with the image combining ratio; attribute-information combining means for combining the first attribute information and the second attribute information in accordance with the attribute-information combining ratio to generate combined attribute information; image processing means for processing the combined image signal by switching image-processing in accordance with the combined attribute information; and wherein the attribute-information combining-ratio determining means digitizes the image combining ratio by using a predetermined threshold to determine the attribute-information combining ratio.