The invention provides a communication method and a communication device for the downlink control information, and relates to the field of LTE and NR mobile communication networks. The communication method comprises the steps of scrambling the cyclic redundancy code (CRC) part of a physical downlink control channel and a physical downlink data channel by adopting a predetermined wireless network temporary identifier (RNTI), wherein the scrambled physical downlink data channel carries the system information for enabling a terminal to conduct a specific service; and sending the scrambled physical downlink control channel and the scrambled physical downlink data channel to a set of terminals for conducting the specific service. In this way, the waste of the wireless resources and the energy consumption of a base station are reduced. The information sending efficiency of the system is improved.