A communication system and method for measuring communication channel qualities of one or more partial bands of a communication band is provided. A mobile station represents measured communication channel qualities of the partial bands by relative value information in a frequency direction and/or time direction and selectively communicates the relative value information to a base station. The relative value information in the frequency direction represents a difference in the communication channel qualities of the partial bands at a first timing. The relative value information in the time direction represents a difference between the communication channel qualities of the partial bands at a second timing and the communication channel qualities of the partial bands at a time prior to the second timing.