Wireless Terminal Apparatus and Wireless Base Station Apparatus

1. A method of wireless terminal apparatus which encodes and transmits a control signal to a wireless base station apparatus, comprising: by a receiver, receiving encoding information which is used at the wireless terminal apparatus and which is transmitted from the wireless base station apparatus; by an encoder, inputting the encoding information comprising a first code, a second code, and a phase shift amount from the receiver, and conducting an encoding and multiplexing operation on the control signal using a first multiplier and a second multiplier, wherein the first multiplier conducts a multiplication operating using the first code on which a phase-shift operation is conducted by a phase shift portion using the phase-shift amount, and where the second multiplier conducts a multiplication operating using the second code; and by a transmitter, transmitting the encoded control signal, wherein the second code is an orthogonal code of a three dimension which is generated from complex numbers and which has a code length of 3.