A deionization filter, comprising: electrodes (10a, 10b) for adsorbing solid matter contained in raw water using electrical attractive force or desorbing the adsorbed solid matter using an electrical repulsive force; a flowmeter provided on a front end or rear end of the deionization filter for obtaining the amount of raw water introduced to the deionization filter; and a power controlling unit applying to the electrodes a deionization voltage for allowing the adsorption of the solid matter or a regeneration voltage for allowing detachment of the adsorbed solid matter, wherein the power controlling unit is configured to generate an accumulated solids amount by adding up amounts of the adsorbed solid matter after applying the deionization voltage to the electrodes, wherein the accumulated solids amount is calculated by: a) multiplying 1) a raw water total dissolved solids value measured during a predetermined period, 2) the amount of raw water introduced to the deionization filter during the predetermined period, and 3) a target TDS removal rate which is a predetermined rate of removing the solid matter from the deionization filter, set depending on a percentage of mineral ions required by a user, wherein the total dissolved solids refers to a total amount of ionic materials in an ionic state, and b) adding up the calculated solids amount for respective periods, and to apply the regeneration voltage when the accumulated solids amount corresponds to a predetermined solids amount limit, wherein the power controlling unit is further configured to calculate the TDS of the solid matter contained in the raw water by measuring a magnitude of a current flowing in the electrodes by applying a voltage having a predetermined magnitude to the electrodes after introducing the raw water to the deionization filter in a state in which voltage is not applied to the electrodes of the deionization filter. electrodes (10a, 10b) for adsorbing solid matter contained in raw water using electrical attractive force or desorbing the adsorbed solid matter using an electrical repulsive force; a flowmeter provided on a front end or rear end of the deionization filter for obtaining the amount of raw water introduced to the deionization filter; and a power controlling unit applying to the electrodes a deionization voltage for allowing the adsorption of the solid matter or a regeneration voltage for allowing detachment of the adsorbed solid matter, wherein the power controlling unit is configured to generate an accumulated solids amount by adding up amounts of the adsorbed solid matter after applying the deionization voltage to the electrodes, wherein the accumulated solids amount is calculated by: a) multiplying 1) a raw water total dissolved solids value measured during a predetermined period, 2) the amount of raw water introduced to the deionization filter during the predetermined period, and 3) a target TDS removal rate which is a predetermined rate of removing the solid matter from the deionization filter, set depending on a percentage of mineral ions required by a user, wherein the total dissolved solids refers to a total amount of ionic materials in an ionic state, and b) adding up the calculated solids amount for respective periods, and to apply the regeneration voltage when the accumulated solids amount corresponds to a predetermined solids amount limit, to generate an accumulated solids amount by adding up amounts of the adsorbed solid matter after applying the deionization voltage to the electrodes, wherein the accumulated solids amount is calculated by: a) multiplying 1) a raw water total dissolved solids value measured during a predetermined period, 2) the amount of raw water introduced to the deionization filter during the predetermined period, and 3) a target TDS removal rate which is a predetermined rate of removing the solid matter from the deionization filter, set depending on a percentage of mineral ions required by a user, wherein the total dissolved solids refers to a total amount of ionic materials in an ionic state, and b) adding up the calculated solids amount for respective periods, and to apply the regeneration voltage when the accumulated solids amount corresponds to a predetermined solids amount limit, wherein the power controlling unit is further configured to calculate the TDS of the solid matter contained in the raw water by measuring a magnitude of a current flowing in the electrodes by applying a voltage having a predetermined magnitude to the electrodes after introducing the raw water to the deionization filter in a state in which voltage is not applied to the electrodes of the deionization filter.