A radio communication apparatus compatible with a plurality of
communication systems and application services comprises a radio
transmitting/receiving unit for transmitting and receiving a radio
signal, signal processing circuit for executing part of digital signal
processing which may be executed when a radio signal is transmitted or
received, first processors connected to the signal processing circuit for
at least executing communication control related to connection between
the radio communication apparatus and the communication systems, and an
application program related to the application services, and second
processors connected to the signal processing circuit for at least
executing another part of the digital signal processing, and control of
the signal processing circuit, the amount of processing of the second
processors being greater than the amount of processing of the first
processors, the processing concerning the executing unit.