A charge/discharge control device, comprising: a first acquirer configured to acquire from an electric energy supply source supplying electric energy to a secondary battery charge identification information identifying the electric energy supply source; a second acquirer configured to acquire the electric energy quantity supplied from the electric energy supply source to the secondary battery; a first storage configured to store the charge identification information acquired by the first acquirer in association with the electric energy quantity acquired by the second acquirer; a second storage configured to store, for each combination of an electric energy supply source and an electric energy supply destination, discharge permission information representing whether the electric energy stored in the secondary battery from the electric energy supply source is dischargeable to the electric energy supply destination; a third acquirer configured to acquire from an electric energy supply destination discharge identification information identifying the electric energy supply destination; a determiner configured to determine whether the electric energy supplied from the electric energy supply source identified by the charge identification information stored in the first storage is dischargeable to the electric energy supply destination identified by the discharge identification information based on the discharge permission information; and a controller configured to control the discharge from the secondary battery to the electric energy supply destination identified by the discharge identification information based on the determination result by the determiner, wherein the control device is configured such that, when the determiner determines that the discharge is possible, the controller identifies from the first storage the electric energy quantity associated with the charge identification information identifying the electric energy supply source determined to be dischargeable to the electric energy supply destination identified by the discharge identification information, and controls the discharge to the electric energy supply destination with the identified electric energy quantity set as the upper limit of dischargeable electric energy quantity. a first acquirer configured to acquire from an electric energy supply source supplying electric energy to a secondary battery charge identification information identifying the electric energy supply source; a second acquirer configured to acquire the electric energy quantity supplied from the electric energy supply source to the secondary battery; a first storage configured to store the charge identification information acquired by the first acquirer in association with the electric energy quantity acquired by the second acquirer; a second storage configured to store, for each combination of an electric energy supply source and an electric energy supply destination, discharge permission information representing whether the electric energy stored in the secondary battery from the electric energy supply source is dischargeable to the electric energy supply destination; a third acquirer configured to acquire from an electric energy supply destination discharge identification information identifying the electric energy supply destination; a determiner configured to determine whether the electric energy supplied from the electric energy supply source identified by the charge identification information stored in the first storage is dischargeable to the electric energy supply destination identified by the discharge identification information based on the discharge permission information; and a controller configured to control the discharge from the secondary battery to the electric energy supply destination identified by the discharge identification information based on the determination result by the determiner, wherein the control device is configured such that, when the determiner determines that the discharge is possible, the controller identifies from the first storage the electric energy quantity associated with the charge identification information identifying the electric energy supply source determined to be dischargeable to the electric energy supply destination identified by the discharge identification information, and controls the discharge to the electric energy supply destination with the identified electric energy quantity set as the upper limit of dischargeable electric energy quantity.