A method for configuring a gap includes transmitting, by a first base station, a first message to a user equipment to configure the gap, the first message including first time reference information and the first timing reference information indicating a cell including, a primary cell of the first base station, a primary cell of a second base station, or a serving cell; and configuring, by using the first message, the user equipment to use a system frame number and a subframe of the cell for gap calculation.