A transmitter, configured to send system information to a terminal, where the system information is used for indicating to the terminal whether a cell covered by the base station supports coverage enhancement, and the system information includes a master information block MIB and/or a system information block SIB. According to the base station provided in an embodiment of the present invention, a transmitter sends, to a terminal, system information used for indicating whether a cell covered by the base station supports coverage enhancement, so that the terminal can accurately learn whether the cell supports communication in a coverage enhancement mode, and the terminal is notified in a timely manner when the cell does not support communication in the coverage enhancement mode, which avoids blind access of the terminal and reduces power consumption of the terminal.