Patent ID: 11929843
Assignee: SAMSUNG SDS CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A device for retrieving chat history from a chat room, the device comprising:
one or more processors;
memory storing instructions configured to cause the one or more processors to:
generate a chat history retrieval request, the chat history retrieval request including an ID of a second user to which a chat-invitation message from a first user participating in the chat room is directed, and an ID of the chat room;
transmit the chat history retrieval request to a server, and receive, from the server, the chat history, the chat history including previous chats of the chat room, wherein each previous chat includes a historical chat transmission time of the chat, a user ID, and a chat content, and wherein the previous chats are included in the chat history based on having respective historical chat transmission times that are after a retrieval start point, the retrieval start point being a time controlling which previous chats of the chat room the second user is able to retrieve based on the historical chat transmission times of the previous chats; and
cause a second device operated by the second user to display the received chat history in a chat window of the second device;
wherein the chat-invitation message includes an ID of the first user, an ID of the second user, an ID of the chat room, a transmission time of the chat-invitation message, and a previous-message time-amount according to which the retrieval start point is to be determined by default; and
wherein the retrieval start point is a time point corresponding to a difference between the time amount and the transmission time of the chat-invitation message.