the present invention relates to an apparatus for synchronizing frame and detecting code group / number that is useful for an initial cell search of an asynchronous imt - 2000 system . to this end , the present invention discloses a method for synchronizing frame and detecting code group / number , including the steps of : synchronizing a slot at the time of a system booting , wherein the system obtains time offsets by using at least two despreaders with different timings from each other ; detecting energies and time offsets based on the designated position of the slot timing ; and detecting frame synchronization and code group / number by using the detected energies and information .