A method for determining a time-domain position of a search space of a downlink control channel, performed by a communication device, said method comprising: determining the time-domain position of the search space corresponding to a terminal, according to terminal parameter information and a search space monitoring periodicity of the terminal; wherein the terminal parameter information comprises: a terminal identity identifier, UE ID, or a cell radio network temporary identifier, C-RNTI, corresponding to the terminal, and the search space monitoring periodicity of the terminal is a predetermined value, wherein, the determining the time-domain position of the search space corresponding to the terminal, according to the terminal parameter information and the search space monitoring periodicity of the terminal comprises: determining, according to the terminal parameter information and the search space monitoring periodicity of the terminal, an index of a time-domain resource of the search space corresponding to the terminal, wherein, the determining, according to the terminal parameter information and the search space monitoring periodicity of the terminal, the index of the time-domain resource of the search space corresponding to the terminal, comprises: determining, according to the terminal parameter information and the search space monitoring periodicity of the terminal, the index of the time-domain resource of the search space corresponding to the terminal by using a first formula; wherein the first formula is: mod( T index, N) = mod ( A, N); mod represents a modulus operator, T index represents the index of the time-domain resource of the search space, N represents the search space monitoring periodicity of the terminal, N is a positive integer greater than or equal to 1, and A represents the terminal parameter information. determining the time-domain position of the search space corresponding to a terminal, according to terminal parameter information and a search space monitoring periodicity of the terminal; wherein the terminal parameter information comprises: a terminal identity identifier, UE ID, or a cell radio network temporary identifier, C-RNTI, corresponding to the terminal, and the search space monitoring periodicity of the terminal is a predetermined value, wherein, the determining the time-domain position of the search space corresponding to the terminal, according to the terminal parameter information and the search space monitoring periodicity of the terminal comprises: determining, according to the terminal parameter information and the search space monitoring periodicity of the terminal, an index of a time-domain resource of the search space corresponding to the terminal, wherein, the determining, according to the terminal parameter information and the search space monitoring periodicity of the terminal, the index of the time-domain resource of the search space corresponding to the terminal, comprises: determining, according to the terminal parameter information and the search space monitoring periodicity of the terminal, the index of the time-domain resource of the search space corresponding to the terminal by using a first formula; wherein the first formula is: mod( T index, N) = mod ( A, N); mod represents a modulus operator, T index represents the index of the time-domain resource of the search space, N represents the search space monitoring periodicity of the terminal, N is a positive integer greater than or equal to 1, and A represents the terminal parameter information. determining, according to the terminal parameter information and the search space monitoring periodicity of the terminal, the index of the time-domain resource of the search space corresponding to the terminal by using a first formula; wherein the first formula is: mod( T index, N) = mod ( A, N); mod represents a modulus operator, T index represents the index of the time-domain resource of the search space, N represents the search space monitoring periodicity of the terminal, N is a positive integer greater than or equal to 1, and A represents the terminal parameter information.