Charging system, charging control program, and portable terminal

A charging system of the present invention is a charging system for charging a battery mounted on a portable telephone , and includes a charging control unit that performs supply and control of the charging electric current and the charging voltage to the battery, a device temperature monitoring unit that monitors the device temperature inside the portable telephone , and a battery temperature monitoring unit that monitors the battery temperature of the battery. The charging control unit controls the charging electric current to be supplied to the battery according to the device temperature monitored by the device temperature monitoring unit and controls the charging voltage to be supplied to the battery according to the battery temperature monitored by the battery temperature monitoring unit