A mass spectrometric system, comprising: a mass spectrometric unit that is configured to measure a specimen at a measurement time and output a mass spectrum; and an estimator that has an estimation rule on content information, the estimation rule being assigned to each component of a plurality of components that may be contained in the specimen and each measurement time, wherein the estimator is configured to estimate, based on the mass spectrum output from the mass spectrometric unit, content information on each component in accordance with the estimation rule; the content information includes at least one of a concentration of a target component in the specimen, a logical value indicating whether the concentration of the target component exceeds a threshold concentration, an order of concentration among target components, a logical value indicating whether the order of concentration among the target components exceeds a threshold order or values derived from these values; and the estimation rule is defined as res t i a = { Positive if ∑ j = 1 L g _ j × I _ j I _ r _ j > TH t i a Negative otherwise. where t is the measurement time, i is a component, a is a measurement operation, res (t, i, a) is a label value indicating an existence determination result, j is an index corresponding to a marker associated to the component such that the magnitude of a peak is stored at the intensity of the marker, L is the number of markers, I_j is the intensity of the marker j corresponding to the magnitude of a peak in the mass spectrum at the measurement time, g_1,..., g_L are a marker coefficients set, r_1,..., r_L are m/z of a reference material set, where m is mass and z is charge number I_r_1,..., I_r_L are intensities of m/z of the reference material, and TH (t, i, a) is a threshold. a mass spectrometric unit that is configured to measure a specimen at a measurement time and output a mass spectrum; and an estimator that has an estimation rule on content information, the estimation rule being assigned to each component of a plurality of components that may be contained in the specimen and each measurement time, wherein the estimator is configured to estimate, based on the mass spectrum output from the mass spectrometric unit, content information on each component in accordance with the estimation rule; the content information includes at least one of a concentration of a target component in the specimen, a logical value indicating whether the concentration of the target component exceeds a threshold concentration, an order of concentration among target components, a logical value indicating whether the order of concentration among the target components exceeds a threshold order or values derived from these values; and the estimation rule is defined as res t i a = { Positive if ∑ j = 1 L g _ j × I _ j I _ r _ j > TH t i a Negative otherwise. t is the measurement time, i is a component, a is a measurement operation, res (t, i, a) is a label value indicating an existence determination result, j is an index corresponding to a marker associated to the component such that the magnitude of a peak is stored at the intensity of the marker, L is the number of markers, I_j is the intensity of the marker j corresponding to the magnitude of a peak in the mass spectrum at the measurement time, g_1,..., g_L are a marker coefficients set, r_1,..., r_L are m/z of a reference material set, where m is mass and z is charge number I_r_1,..., I_r_L are intensities of m/z of the reference material, and TH (t, i, a) is a threshold.