Disclosed are methods and systems for displaying a conversation thread. A conversation thread displaying method including classifying messages transmitted and received through at least one conversation session to generate a conversation thread for each of the at least one conversation session, providing a conversation session list, displaying messages of a selected conversation thread selected from the conversation session list, receiving a conversation summary request for the messages of the selected conversation thread, and providing a conversation summary for the messages of the selected conversation thread in response to the conversation summary request for the messages of the selected conversation thread may be provided.