A battery management apparatus, configured to monitor a state of a bus bar electrically connected on its first end to an input and output terminal of a battery pack including at least one battery module, the battery management apparatus comprising: a voltage measurement unit comprising a plurality of measurement channels (Si,..., S n+1) respectively electrically connected to a plurality of battery cells (C1 1,..., C1 n) included in the battery module and configured to measure voltages applied to the plurality of measurement channels; a measurement target changing unit comprising a first measurement line for electrically connecting a positive electrode terminal of a first battery cell among the plurality of battery cells to both a first measurement channel (Si) among the plurality of measurement channels and a second end of the bus bar; a second measurement line for electrically connecting the first end of the bus bar to the first measurement channel; a first switching element for electrically connecting or disconnecting the second measurement line; and a processor configured to control an operation state of the first switching element and calculate a bus bar voltage applied to the bus bar based on a voltage applied to the first measurement channel and a voltage applied to a measurement channel other than the first measurement channel among the plurality of measurement channels, characterized in that, after the operation state of the first switching element is controlled into a turn-on state, the processor is configured to calculate a cell voltage average of the battery cells other than the first battery cell among the plurality of battery cells based on the voltage applied to the measurement channel other than the first measurement channel, calculate a first voltage difference between the voltage applied to the first measurement channel and a voltage applied to a second measurement channel electrically connected to a negative electrode terminal of the first battery cell, and calculate the bus bar voltage based on difference between the first voltage difference and the cell voltage average. a voltage measurement unit comprising a plurality of measurement channels (Si,..., S n+1) respectively electrically connected to a plurality of battery cells (C1 1,..., C1 n) included in the battery module and configured to measure voltages applied to the plurality of measurement channels; a measurement target changing unit comprising a first measurement line for electrically connecting a positive electrode terminal of a first battery cell among the plurality of battery cells to both a first measurement channel (Si) among the plurality of measurement channels and a second end of the bus bar; a second measurement line for electrically connecting the first end of the bus bar to the first measurement channel; a first switching element for electrically connecting or disconnecting the second measurement line; and a processor configured to control an operation state of the first switching element and calculate a bus bar voltage applied to the bus bar based on a voltage applied to the first measurement channel and a voltage applied to a measurement channel other than the first measurement channel among the plurality of measurement channels, characterized in that, after the operation state of the first switching element is controlled into a turn-on state, the processor is configured to calculate a cell voltage average of the battery cells other than the first battery cell among the plurality of battery cells based on the voltage applied to the measurement channel other than the first measurement channel, calculate a first voltage difference between the voltage applied to the first measurement channel and a voltage applied to a second measurement channel electrically connected to a negative electrode terminal of the first battery cell, and calculate the bus bar voltage based on difference between the first voltage difference and the cell voltage average.