Disclosed is a client device for personalizing an advertisement, the client device including a memory storing instructions, and a processor, wherein the processor is configured to execute the instructions to obtain, through an advertisement personalization unit, activity information about a user related to the client device, based on an artificial intelligence learning model and the activity information, generate, through the advertisement personalization unit, a personalized advertisement query for the user, transmit, through the advertisement personalization unit, the advertisement query to an advertisement management server, receive, through the advertisement personalization unit, information about at least one advertisement corresponding to the advertisement query, from the advertisement management server, and provide, through the advertisement personalization unit, part or all of the information about the at least one advertisement, to an advertisement output unit.