A solid propellant rocket engine includes: a propellant formed into a predetermined shape having a combustion cavity and capable of deflagrating into hot, high-pressure gas upon ignition; and a nozzle configured and positioned to expand the hot, high-pressure gas into the atmosphere, where the propellant forms the nozzle as a part of the predetermined shape. The difference h in depth of the recessed or projecting portion is set to. The circuit section selectively executes a read mode, program mode, and erase mode for performing data read, programming, and erase to the memory cells, and a rewrite mode for rewriting data stored in each memory cell. Thus, users experiencing good communication conditions with low multipath distortion may be allocated higher capacity, whereas users with significant multipath distortion may make use of lower rate error codes to maintain high quality.