A train-information management device that is provided on a train, that manages information on devices provided in a vehicle comprised in said train, and that controls each of the devices, the train-information management device comprising: a position detection unit that detects a position of the train; and a regenerating-condition detection unit that detects whether the train is in a condition of using a regenerative brake; characterized in that the train-information management device further comprises: a train-line information holding unit that holds therein information on a section in which a train is more likely to use a brake; an air-conditioning set-value holding unit that holds therein a temperature set value of an air conditioner; and a target-temperature control unit that decides a target temperature that is designated to the air conditioner on the basis of a detection result obtained by the position detection unit, a detection result obtained by the regenerating-condition detection unit, information held in the train-line information holding unit, and information held in the air-conditioning set-value holding unit, wherein in a regeneration-preparation condition where a train is running through a position at which a distance between the position and a section in which a train is more likely to use a brake is equal to or less than a given value and is running toward the section, and where a train does not use a regenerative brake, the target-temperature control unit decides a value, generated by adding a predetermined value to the temperature set value, as the target temperature, in a regenerating condition where the train uses a regenerative brake, the target-temperature control unit decides a value, generated by subtracting a predetermined value from the temperature set value, as the target temperature, and in a normal condition that corresponds neither to the regeneration-preparation condition nor to the regenerating condition, the target-temperature control unit decides the temperature set value as the target temperature. a position detection unit that detects a position of the train; and a regenerating-condition detection unit that detects whether the train is in a condition of using a regenerative brake; a train-line information holding unit that holds therein information on a section in which a train is more likely to use a brake; an air-conditioning set-value holding unit that holds therein a temperature set value of an air conditioner; and a target-temperature control unit that decides a target temperature that is designated to the air conditioner on the basis of a detection result obtained by the position detection unit, a detection result obtained by the regenerating-condition detection unit, information held in the train-line information holding unit, and information held in the air-conditioning set-value holding unit, wherein in a regeneration-preparation condition where a train is running through a position at which a distance between the position and a section in which a train is more likely to use a brake is equal to or less than a given value and is running toward the section, and where a train does not use a regenerative brake, the target-temperature control unit decides a value, generated by adding a predetermined value to the temperature set value, as the target temperature, in a regenerating condition where the train uses a regenerative brake, the target-temperature control unit decides a value, generated by subtracting a predetermined value from the temperature set value, as the target temperature, and in a normal condition that corresponds neither to the regeneration-preparation condition nor to the regenerating condition, the target-temperature control unit decides the temperature set value as the target temperature.