Method for indicating preemption in a communication system using a bitmap corresponding to resources

An operation method of a base station in a communication system, the operation method comprising:

• transmitting a first downlink control information (DCI) including resource allocation information to a terminal;
• transmitting data using a first resource among resources indicated by the resource allocation information to the terminal, the resources including the first resource and a second resource;
• and
• transmitting a second DCI including a preemption indication (PI) to the terminal,
• wherein the second resource corresponding to the PI is not used for transmission of the data, the PI includes a bitmap, each bit included in the bitmap indicates whether or not a resource group corresponding to the each bit among a plurality of resource groups is used for the transmission, a time resource region of the plurality of resource groups associated with the bitmap belongs to a symbol set, and a size of the symbol set is determined based on a ratio of a first subcarrier spacing applied to the plurality of resource groups associated with the bitmap and a second subcarrier spacing applied to a channel where the second DCI is received.