1. A method for detecting a rate of input, the method comprising: collecting log data comprising at least one input keyword from at least one search server during a time interval; determining an input rate of the at least one input keyword using the log data, and storing the input rate of the at least one input keyword in association with input time data in a database; identifying, in the database, the input time data associated with the at least one input keyword during a sliding window, and determining a number of times the at least one input keyword has been input to the at least one search server during the sliding window; determining an estimated search input rate of the at least one input keyword by referring to the number of times the at least one input keyword has been input to the at least one search server during the sliding window; ranking the at least one input keyword using the number of times the at least one input keyword has been input to the at least one search server during the sliding window; determining a first criterion value for the at least one input keyword by using the ranking; determining a second criterion value for the at least one input keyword by using a minimum search number and the estimated search input rate; and detecting in real time an input keyword having an increased input rate, based on the first criterion value and the second criterion value.