The amount of control information is reduced for specifying the transmission method for simultaneously transmitting uplink data and reception quality information, and uplink data and ACK/NACK. Delay in changing the transmission method is reduced, and the mapping of uplink data and reception quality information and of uplink data and ACK/NACK is realized, in compliance with modulation scheme and coding rate of the uplink data specified by the base station apparatus. In a mobile communication system the base station apparatus allocates, to the mobile station apparatus, resources wherein the base station apparatus transmits, to the mobile station apparatus, control information for specifying a transmission format for the mobile station apparatus to transmit information using the uplink, while the mobile station apparatus simultaneously transmits, to the base station apparatus, uplink data and reception quality information based on the specified transmission format when the control information from the base station apparatus is received.