A method of transmitting information, the method comprises: Selecting, by a network side, candidate Enhanced-Physical Downlink Control Channels, E-PDCCHs, for carrying DCI from a set of candidate E-PDCCHs, wherein the set of candidate E-PDCCHs includes E-PDCCHs occupying a plurality of time-frequency resources consecutive in frequency domain and E-PDCCHs occupying a plurality of time-frequency resources inconsecutive in frequency domain; and transmitting, by the network side, the DCI over the selected candidate E-PDCCHs; wherein selecting, by the network side, the candidate E-PDCCHs for carrying the DCI comprises: selecting, by the network side, the candidate E-PDCCHs for carrying the DCI from the set of candidate E-PDCCHs according to an aggregation level of the DCI to be transmitted; wherein the time-frequency resources occupied at the aggregation level are configured flexibly, a time-frequency resource at an aggregation level is an Enhanced-Control Channel Element, E-CCE, and the size of the E-CCE is configured flexibly according to a resource configuration or a carrier configuration; wherein before the network side transmits the DCI, the method further comprises: determining, by the network side, the size of time-frequency resources occupied at the aggregation level according to a resource configuration or a carrier configuration. Selecting, by a network side, candidate Enhanced-Physical Downlink Control Channels, E-PDCCHs, for carrying DCI from a set of candidate E-PDCCHs, wherein the set of candidate E-PDCCHs includes E-PDCCHs occupying a plurality of time-frequency resources consecutive in frequency domain and E-PDCCHs occupying a plurality of time-frequency resources inconsecutive in frequency domain; and transmitting, by the network side, the DCI over the selected candidate E-PDCCHs; wherein selecting, by the network side, the candidate E-PDCCHs for carrying the DCI comprises: selecting, by the network side, the candidate E-PDCCHs for carrying the DCI from the set of candidate E-PDCCHs according to an aggregation level of the DCI to be transmitted; wherein the time-frequency resources occupied at the aggregation level are configured flexibly, a time-frequency resource at an aggregation level is an Enhanced-Control Channel Element, E-CCE, and the size of the E-CCE is configured flexibly according to a resource configuration or a carrier configuration; wherein before the network side transmits the DCI, the method further comprises: determining, by the network side, the size of time-frequency resources occupied at the aggregation level according to a resource configuration or a carrier configuration. selecting, by the network side, the candidate E-PDCCHs for carrying the DCI from the set of candidate E-PDCCHs according to an aggregation level of the DCI to be transmitted; wherein the time-frequency resources occupied at the aggregation level are configured flexibly, a time-frequency resource at an aggregation level is an Enhanced-Control Channel Element, E-CCE, and the size of the E-CCE is configured flexibly according to a resource configuration or a carrier configuration; wherein before the network side transmits the DCI, the method further comprises: determining, by the network side, the size of time-frequency resources occupied at the aggregation level according to a resource configuration or a carrier configuration.