A communication method, comprising: receiving indication information indicating whether system information corresponding to a common signal block exists by using N1 bits in a physical broadcast channel, PBCH, of the common signal block, wherein a common signal block is associated with a detection window of a control channel of the system information, the N1 bits are further used to indicate a physical resource block grid offset being an offset of a physical resource block grid of the common signal block relative to an index of a system common physical resource block, wherein the physical resource block grid offset is in unit of sub-carrier, and N1 is an integer greater than 0; when the N1 bits indicate a normal value of the physical resource block grid offset, the system information corresponding to the common signal block exists; when the N1 bits indicate a value different from the normal value, the system information corresponding to the common signal block does not exist; receiving control channel configuration information from a network device, wherein the control channel configuration information comprises detection window indication information of the control channel, and wherein the detection window indication information of the control channel indicates a resource multiplexing mode of a resource set of the control channel and the common signal block and a time-domain start location of the detection window of the control channel, wherein a duration of the detection window of the control channel is determined according to the resource multiplexing mode; and determining, according to the control channel configuration information, the detection window of the control channel. receiving indication information indicating whether system information corresponding to a common signal block exists by using N1 bits in a physical broadcast channel, PBCH, of the common signal block, wherein a common signal block is associated with a detection window of a control channel of the system information, the N1 bits are further used to indicate a physical resource block grid offset being an offset of a physical resource block grid of the common signal block relative to an index of a system common physical resource block, wherein the physical resource block grid offset is in unit of sub-carrier, and N1 is an integer greater than 0; when the N1 bits indicate a normal value of the physical resource block grid offset, the system information corresponding to the common signal block exists; when the N1 bits indicate a value different from the normal value, the system information corresponding to the common signal block does not exist; receiving control channel configuration information from a network device, wherein the control channel configuration information comprises detection window indication information of the control channel, and wherein the detection window indication information of the control channel indicates a resource multiplexing mode of a resource set of the control channel and the common signal block and a time-domain start location of the detection window of the control channel, wherein a duration of the detection window of the control channel is determined according to the resource multiplexing mode; and determining, according to the control channel configuration information, the detection window of the control channel.