The present invention relates to an apparatus and method for automatic frequency control in a mobile communication system, comprising: a timing controller for detecting a slot boundary with respect to a received signal and identifying a symbol allocated at the beginning and the end of the slot by the slot boundary; Correlation is performed on a predetermined number of samples from a position corresponding to the slot boundary and a predetermined number of samples having a predetermined interval from the slot boundary position in the identified symbol to obtain a frequency offset It is possible to reduce the complexity of the circuit and to operate the frequency offset more quickly by including the automatic frequency control unit that estimates, thereby reducing the occurrence of lose lock that loses frequency synchronization and ensuring stable reception performance of the terminal device .;Automatic frequency control, frequency offset, cyclic prefix, cyclic prefix, OFDM
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