1. A method for detecting a rate of input, the method comprising: collecting log data which includes at least one keyword input to at least one search server during a predetermined time interval; determining the at least one keyword's input rate during the predetermined time interval by using the log data, and storing the input rate in association with an input time data in a database; identifying in the database at least one input time data associated with the input of the at least one keyword to the at least one search server in a predetermined sliding window, and determining the number of times the at least one keyword has been input to the at least one search server during the predetermined sliding window; determining an estimated search input rate of the at least one keyword by referring to the number of times the at least one keyword has been input to the at least one search server during the predetermined sliding window; ranking the at least one keyword using the number of times the at least one keyword has been input to the at least one search server during the predetermined sliding window; determining a third criterion value for the keyword by using the ranking of the at least one keyword; determining a fourth criterion value for the keyword by using a predetermined minimum search number and the estimated search input rate; and detecting in real time if the at least one keyword has an increased input rate on a basis of the third criterion value and the fourth criterion value.