An apparatus for measuring current and voltage of a secondary battery pack in synchronization manner, comprising: a voltage measurement circuit configured to sequentially measure and output the level of a charging voltage of each of a plurality of battery cells (V 1, V 2, V 3, V 4) contained in a battery pack on a regular cycle; a current measurement circuit configured to periodically measure and output the level of a current flowing into or out of the battery pack; and a control unit configured to calculate a time difference (T n) between a current measurement time point of the battery pack and a voltage measurement time point of a K th cell, to compare the calculated time difference (T n) with a reference delay time (ΔT) and to calculate a time error therebetween, and to synchronize said time difference (T n) with the reference delay time (ΔT) preset in advance, characterized in that: a sampling period (T s) of the voltage measurement of the plurality of battery cells (V 1, V 2, V 3, V 4) or of the current measurement of the battery pack is equally fixed; and if there is the time error between the reference delay time (ΔT) and the time difference (T n) between the current measurement time point of the battery pack and a voltage measurement time point of the K th battery cell, - when the sampling period (T s) of the voltage measurement is equally fixed, the control unit is configured to adjust a next current measurement time point of the battery pack by the time error based on a voltage measurement time point of a K+1 th battery cell such that the time difference (T n) becomes equal to the reference delay time (ΔT), or - when the sampling period (T s) of the current measurement is equally fixed, the control unit is configured to adjust a voltage measurement time point of a K+1 th battery cell by the time error based on a next current measurement time point of the battery pack such that the time difference (T n) becomes equal to the reference delay time (ΔT). a voltage measurement circuit configured to sequentially measure and output the level of a charging voltage of each of a plurality of battery cells (V 1, V 2, V 3, V 4) contained in a battery pack on a regular cycle; a current measurement circuit configured to periodically measure and output the level of a current flowing into or out of the battery pack; and a control unit configured to calculate a time difference (T n) between a current measurement time point of the battery pack and a voltage measurement time point of a K th cell, to compare the calculated time difference (T n) with a reference delay time (ΔT) and to calculate a time error therebetween, and to synchronize said time difference (T n) with the reference delay time (ΔT) preset in advance, characterized in that: a sampling period (T s) of the voltage measurement of the plurality of battery cells (V 1, V 2, V 3, V 4) or of the current measurement of the battery pack is equally fixed; and if there is the time error between the reference delay time (ΔT) and the time difference (T n) between the current measurement time point of the battery pack and a voltage measurement time point of the K th battery cell, - when the sampling period (T s) of the voltage measurement is equally fixed, the control unit is configured to adjust a next current measurement time point of the battery pack by the time error based on a voltage measurement time point of a K+1 th battery cell such that the time difference (T n) becomes equal to the reference delay time (ΔT), or - when the sampling period (T s) of the current measurement is equally fixed, the control unit is configured to adjust a voltage measurement time point of a K+1 th battery cell by the time error based on a next current measurement time point of the battery pack such that the time difference (T n) becomes equal to the reference delay time (ΔT). a sampling period (T s) of the voltage measurement of the plurality of battery cells (V 1, V 2, V 3, V 4) or of the current measurement of the battery pack is equally fixed; and if there is the time error between the reference delay time (ΔT) and the time difference (T n) between the current measurement time point of the battery pack and a voltage measurement time point of the K th battery cell, - when the sampling period (T s) of the voltage measurement is equally fixed, the control unit is configured to adjust a next current measurement time point of the battery pack by the time error based on a voltage measurement time point of a K+1 th battery cell such that the time difference (T n) becomes equal to the reference delay time (ΔT), or - when the sampling period (T s) of the current measurement is equally fixed, the control unit is configured to adjust a voltage measurement time point of a K+1 th battery cell by the time error based on a next current measurement time point of the battery pack such that the time difference (T n) becomes equal to the reference delay time (ΔT). - when the sampling period (T s) of the voltage measurement is equally fixed, the control unit is configured to adjust a next current measurement time point of the battery pack by the time error based on a voltage measurement time point of a K+1 th battery cell such that the time difference (T n) becomes equal to the reference delay time (ΔT), or - when the sampling period (T s) of the current measurement is equally fixed, the control unit is configured to adjust a voltage measurement time point of a K+1 th battery cell by the time error based on a next current measurement time point of the battery pack such that the time difference (T n) becomes equal to the reference delay time (ΔT).