The present invention relates to an apparatus and a method for reducing standby power of a multi-type air conditioner. When the indoor unit does not operate for a predetermined time in a multi-type air conditioner, the air conditioner is turned off by shutting off power supplied to a communication unit included in the indoor unit. The present invention relates to an apparatus and method for reducing standby power of a multi-type air conditioner capable of reducing power generated by communication between an indoor unit and an outdoor period in a mode.;To this end, the present invention, in the multi-type air conditioner including a communication unit for performing communication between the indoor unit and the outdoor unit, respectively, the power cut-off unit for connecting or disconnecting the power supplied to the communication unit and determining the stop condition of the communication unit And a microcomputer for controlling the power cutoff unit to cut off power supplied to the communication unit when the stop condition is met.
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