| CPC H04L 51/216 (2022.05) [H04L 51/04 (2013.01)] | 13 Claims |

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1. A method for providing a core conversation preview of an unread conversation, the method being performed by at least one processor and comprising:
determining, in response to an input for a first chat room in a list of chat rooms, core conversations of unread conversations included in the first chat room;
displaying a preview window comprising the core conversations; and
in response to a user input for each of the core conversations being received consecutively on the preview window, displaying a message input box below each of the core conversations on the preview window.
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