Embodiments relate to a data-collection apparatus and a data-collection system using the same. The data-collection apparatus includes a battery, a wireless unit to communicate wirelessly to an external device, a measurement unit to measure a measurement target, a power-supply circuit unit to control power supply to the wireless unit and the measurement unit, and a controller. In response to a data-collection start command from the external device, the controller performs a control such that the power-supply circuit unit supplies power to the measurement unit and wireless unit, and that the data measured by the measurement unit is transmitted via the wireless unit to the external device. In response to a power-saving command from the external device, the controller performs a control such that the power-supply circuit unit stops supplying power to the measurement unit and wireless unit for a predetermined period.