The present invention provides a channel quality indicator (CQI) transmission method carried out by means of a terminal supporting a relatively short transmission time interval (S-TTI) compared to a legacy transmission time interval (L-TTI) in a wireless communication system. The method is characterized by: determining an overhead associated with a predefined control channel in accordance with whether or not S-TTI-based communication is being carried out; and transmitting the CQI on the basis of the determined overhead associated with the predefined control channel, wherein, if the S-TTI-based communication is being carried out, the overhead, which is associated with the predefined control channel, is determined in the same way between an S-TTI comprising a legacy physical downlink control channel (PDCCH) region and an S-TTI not comprising a legacy PDCCH region.