1. A method for frequency domain spreading and transmitting, the method comprising:obtaining, by a user equipment, indication information of an orthogonal sequence for transmitting a Physical Uplink Control Channel (PUCCH);
spreading, by the user equipment, uplink control information carried in the PUCCH in the frequency domain according to the orthogonal sequence corresponding to the indication information of the orthogonal sequence; and
transmitting, by the user equipment, the uplink control information after spreading, over frequency resources corresponding to the PUCCH;
wherein the spreading the uplink control information carried in the PUCCH in the frequency domain comprises:
for each data symbol in the PUCCH, multiplying the data symbol with the corresponding orthogonal sequence to obtain a spread data symbol, and mapping the spread data symbol onto a Resource Element (RE) group in an SC-FDMA symbol, wherein there are NSFPUCCH REs in the RE group, and NSFPUCCH represents a length of the orthogonal sequence.