A method for displaying a progress state of processing data and a host computer for implementing the method is provided. Further, a method for displaying a plurality of progress states of processing data and a host computer for implementing the method is provided. According to the method, at least more than a signal representing a plurality of progress states of processing data are generated, and a plurality of progress states of processing data are respectively displayed according to the generated signals. The method displays a progress state of the image data reception and a progress state of processing the image data by using a plurality of progress bars, respectively, so that a user may easily check the progress state of the reception of the image data and the progress state of the image process of the image data.