A charge/discharge test system, comprising: a two-way AC/DC converter that has one end connected to an alternating current power source via an AC bus, and another end connected to a first DC bus; wherein the charge/discharge test system comprises: a first charge/discharge test device that includes a second DC bus connected to the first DC bus, a plurality of first two-way DC/DC converters, each of which has one end connected to the second DC bus and another end connected to a first charging/discharging object (28, 28-1, 28-2) among a plurality of first charging/discharging objects (28, 28-1, 28-2), and a first converter control unit that controls charging and discharging of the plurality of first charging/discharging objects (28, 28-1, 28-2); a setting unit that sets at least one charge/discharge pattern (P1, P2) corresponding to at least one test charging/discharging object serving as a target of a charge/discharge test among the first charging/discharging objects (28, 28-1, 28-2); and a prediction unit that generates a power prediction pattern indicating a temporal change in a total value of charge and discharge power of at least one testing converter corresponding to the at least one test charging/discharging object in the first two-way DC/DC converters, based on the at least one charge/discharge pattern (P1, P2), wherein the first converter control unit controls charging and discharging of the first charging/discharging objects (28, 28-1, 28-2) by the first two-way DC/DC converters, based on the at least one charge/discharge pattern (P1, P2) and on the power prediction pattern. a two-way AC/DC converter that has one end connected to an alternating current power source via an AC bus, and another end connected to a first DC bus; wherein the charge/discharge test system comprises: a first charge/discharge test device that includes a second DC bus connected to the first DC bus, a plurality of first two-way DC/DC converters, each of which has one end connected to the second DC bus and another end connected to a first charging/discharging object (28, 28-1, 28-2) among a plurality of first charging/discharging objects (28, 28-1, 28-2), and a first converter control unit that controls charging and discharging of the plurality of first charging/discharging objects (28, 28-1, 28-2); a setting unit that sets at least one charge/discharge pattern (P1, P2) corresponding to at least one test charging/discharging object serving as a target of a charge/discharge test among the first charging/discharging objects (28, 28-1, 28-2); and a prediction unit that generates a power prediction pattern indicating a temporal change in a total value of charge and discharge power of at least one testing converter corresponding to the at least one test charging/discharging object in the first two-way DC/DC converters, based on the at least one charge/discharge pattern (P1, P2), wherein the first converter control unit controls charging and discharging of the first charging/discharging objects (28, 28-1, 28-2) by the first two-way DC/DC converters, based on the at least one charge/discharge pattern (P1, P2) and on the power prediction pattern. a first charge/discharge test device that includes a second DC bus connected to the first DC bus, a plurality of first two-way DC/DC converters, each of which has one end connected to the second DC bus and another end connected to a first charging/discharging object (28, 28-1, 28-2) among a plurality of first charging/discharging objects (28, 28-1, 28-2), and a first converter control unit that controls charging and discharging of the plurality of first charging/discharging objects (28, 28-1, 28-2); a setting unit that sets at least one charge/discharge pattern (P1, P2) corresponding to at least one test charging/discharging object serving as a target of a charge/discharge test among the first charging/discharging objects (28, 28-1, 28-2); and a prediction unit that generates a power prediction pattern indicating a temporal change in a total value of charge and discharge power of at least one testing converter corresponding to the at least one test charging/discharging object in the first two-way DC/DC converters, based on the at least one charge/discharge pattern (P1, P2), wherein the first converter control unit controls charging and discharging of the first charging/discharging objects (28, 28-1, 28-2) by the first two-way DC/DC converters, based on the at least one charge/discharge pattern (P1, P2) and on the power prediction pattern.