Provided are a method and a device for transmitting and receiving downlink control information. In particular, a method and device may be provided for configuring a downlink control information transmission format in a carrier aggregation situation among serving cells having different duplex modes. A method of a base station for transmitting downlink control information includes the steps of: configuring a downlink control information format on the basis of the duplex mode of one cell among the plurality of cells configured in a terminal performing Carrier aggregation; and transmitting the downlink control information by using the downlink control information format.