Abstract: Proposed is a method for providing a reaction set for content by a server. The method may include receiving first reaction custom information for a first chat room from a first terminal, and generating a first reaction set including at least one reaction information item selected based on the first reaction custom information. The method may also include in response to a second terminal entering the first chat room, providing the second terminal with at least one first content posted in the first chat room and a first reaction set corresponding to each of the at least one first content. The method may further include receiving selection information on a reaction information item included in the first reaction set from the second terminal.