Server and method for providing online threat data based on user-customized keywords for private channel

A server for providing online threat data based on user-customized keywords, the server comprising:

• a processor;
• and
• a memory storing instructions executable by the processor,
• wherein the processor is configured to execute the instructions to:
• access a channel of a messenger program and collect channel-specific online threat data,
• generate a keyword recommendation model for recommending keywords by using the channel-specific online threat data, wherein the keywords match characters or strings that are input by a user to a user terminal through a user-customized keyword registration procedure,
• analyze the channel-specific online threat data to extract an online threat string, use the online threat string as an index to generate information for retrieving the channel-specific online threat data, and store the generated information in a channel-specific database,
• when the characters or strings are input by the user to the user terminal through the user-customized keyword registration procedure, recommend the keywords that match the characters or strings by using the keyword recommendation model, and determine the user-customized keywords among the recommended keywords,
• when the user-customized keywords and a user identifier are received from the user terminal through the user-customized keyword registration procedure, match the user-customized keywords with the user identifier and store the matched user-customized keywords and user identifier in a user-customized keyword database, and
• when the user terminal logs in using the user identifier, extract a pre-registered user-customized keyword corresponding to the user identifier from the user-customized keyword database, extract the channel-specific online threat data corresponding to the user-customized keywords from the channel-specific database, and provide the extracted online threat data to the user terminal, and
• wherein the processor is further configured to execute the instructions to:
• extract tokens from the online threat string based on spaces in the online threat string,
• determine whether the extracted tokens are stored as indexes in the channel-specific database, and
• based on a token among the extracted tokens being stored as an index in the channel-specific database, store an identifier of the online threat string in an identifier item corresponding to the index of the token in the channel-specific database.