A radio communication apparatus comprising: a spreading unit configured to spread an ACK or NACK with an orthogonal sequence, which is one of plural orthogonal sequences, and with a sequence defined by a cyclic shift value, which is one of plural cyclic shift values and which is associated with the orthogonal sequence; and a transmitting unit configured to transmit the ACK or NACK, wherein: each of the plural orthogonal sequences is an orthogonal sequence comprised of 4 chips; the plural orthogonal sequences include a first orthogonal sequence and a second orthogonal sequence with significant inter-code interference there between, wherein a sequence comprised of 2 chips in the first half of the first orthogonal sequence is not orthogonal to a sequence comprised of 2 chips in the first half of the second orthogonal sequence, and a sequence comprised of 2 chips in the second half of the first orthogonal sequence is not orthogonal to a sequence comprised of 2 chips in the second half of the second orthogonal sequence; characterized in that the apparatus comprises a control section and since the first orthogonal sequence and the second orthogonal sequence are with significant inter-code interference there between, the control section is configured to control the cyclic shift values such that a cyclic shift value associated with the first orthogonal sequence which is different from a cyclic shift value associated with the second orthogonal sequence is used by the spreading unit. a spreading unit configured to spread an ACK or NACK with an orthogonal sequence, which is one of plural orthogonal sequences, and with a sequence defined by a cyclic shift value, which is one of plural cyclic shift values and which is associated with the orthogonal sequence; and a transmitting unit configured to transmit the ACK or NACK, wherein: each of the plural orthogonal sequences is an orthogonal sequence comprised of 4 chips; the plural orthogonal sequences include a first orthogonal sequence and a second orthogonal sequence with significant inter-code interference there between, wherein a sequence comprised of 2 chips in the first half of the first orthogonal sequence is not orthogonal to a sequence comprised of 2 chips in the first half of the second orthogonal sequence, and a sequence comprised of 2 chips in the second half of the first orthogonal sequence is not orthogonal to a sequence comprised of 2 chips in the second half of the second orthogonal sequence; characterized in that the apparatus comprises a control section and since the first orthogonal sequence and the second orthogonal sequence are with significant inter-code interference there between, the control section is configured to control the cyclic shift values such that a cyclic shift value associated with the first orthogonal sequence which is different from a cyclic shift value associated with the second orthogonal sequence is used by the spreading unit. each of the plural orthogonal sequences is an orthogonal sequence comprised of 4 chips; the plural orthogonal sequences include a first orthogonal sequence and a second orthogonal sequence with significant inter-code interference there between, wherein a sequence comprised of 2 chips in the first half of the first orthogonal sequence is not orthogonal to a sequence comprised of 2 chips in the first half of the second orthogonal sequence, and a sequence comprised of 2 chips in the second half of the first orthogonal sequence is not orthogonal to a sequence comprised of 2 chips in the second half of the second orthogonal sequence; characterized in that the apparatus comprises a control section and since the first orthogonal sequence and the second orthogonal sequence are with significant inter-code interference there between, the control section is configured to control the cyclic shift values such that a cyclic shift value associated with the first orthogonal sequence which is different from a cyclic shift value associated with the second orthogonal sequence is used by the spreading unit.