NOVELTY - The apparatus has a resistance value acquisition part for acquiring a direct current resistance value and alternating current resistance value as electrical resistance value, where information shows relationship between a difference value of a direct current resistance value, an alternating current resistance value and temperature of a non-aqueous electrolyte secondary battery. A temperature calculation part calculates temperature of the secondary battery such that the difference value of the direct current resistance value and the alternating current resistance value is used.    USE - Battery temperature measuring apparatus for use in a secondary battery apparatus (claimed) i.e. lead acid battery apparatus, used in a mobile type power supplies e.g. motor vehicle and bicycle, and fixed-type power supply i.e. power supply for point of sale system.    ADVANTAGE - The temperature calculation part calculates temperature of the secondary battery such that the difference value of the direct current resistance value and the alternating current resistance value is used, so that temperature of a secondary battery cell can be measured without using a thermistor and a thermocouple, thus obtaining the apparatus with a simple structure.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a battery temperature measuring method    (2) a program comprising g a set of instructions for executing a battery temperature measuring method.    DESCRIPTION OF DRAWING(S) - The drawing shows a flow chart illustrating flow of temperature measurement process performed by a battery management apparatus.'(Drawing includes non-English language text)'    Step for receiving charging capacity and voltage of battery cell from assembled battery monitoring circuit as physical quantity for state determination of secondary battery cell (S1)    Step for determining whether charging capacity and voltage of specified condition are in stipulated range (S2)    Step for using DC-voltage value and alternating voltage value of secondary battery cell (S3)    Step for computing actual electrical resistance value of secondary battery cell (S4)    Step for computing temperature of battery cell (S5)