Provided are a multi-channel flash memory system capable of increasing the overall bandwidth by using a plurality of flash memory chips, and a programming method performed in the flash memory system. The flash memory system includes: a plurality of channel units each including at least two flash memory chips, a control unit which controls the flash memory chips, and a buffer unit which stores external data; and a host interface unit which transmits data separated according to the number of the channel units and transmitted by a host to the buffer units of the channel units, wherein the control unit records the data stored in the buffer unit into the at least two flash memory chips.