An induction heating system comprising: a plurality of induction heating apparatuses, each of the induction heating apparatuses comprising a high-frequency current transformer, a low-frequency current transformer, and a heating coil to which a secondary side of the high-frequency current transformer and a secondary side of the low-frequency current transformer are connected in parallel; a high-frequency input switch connected to a primary side of the high-frequency current transformer; a low-frequency input switch connected to a primary side of the low-frequency current transformer; a first power source configured to adjust a ratio of a high frequency output time and a low frequency output time with respect to an output period and to output a high frequency electric power and a low frequency electric power; a second power source configured to output an electric power of a frequency that is different from a frequency of the electric power output from the first power source; a first power source output switch arranged to be connectable to a low-frequency output terminal of the first power source; a second power source output switch arranged to be connectable to an output terminal of the second power source; and a switch controller configured to control the high-frequency input switch and the low-frequency input switch for each of the induction heating apparatuses and to control the first power source output switch and the second power source output switch so as to connect at least one of the induction heating apparatuses to at least one of the first power source and the second power source, wherein each of the induction heating apparatuses further comprises a heater controller configured to send a switching request signal to the switching controller to turn on one of the first power source output switch and the second power source output switch, to turn off the other of the first power source output switch and the second power source output switch, and to switch on or off each of the high-frequency input switch and the low-frequency input switch. a plurality of induction heating apparatuses, each of the induction heating apparatuses comprising a high-frequency current transformer, a low-frequency current transformer, and a heating coil to which a secondary side of the high-frequency current transformer and a secondary side of the low-frequency current transformer are connected in parallel; a high-frequency input switch connected to a primary side of the high-frequency current transformer; a low-frequency input switch connected to a primary side of the low-frequency current transformer; a first power source configured to adjust a ratio of a high frequency output time and a low frequency output time with respect to an output period and to output a high frequency electric power and a low frequency electric power; a second power source configured to output an electric power of a frequency that is different from a frequency of the electric power output from the first power source; a first power source output switch arranged to be connectable to a low-frequency output terminal of the first power source; a second power source output switch arranged to be connectable to an output terminal of the second power source; and a switch controller configured to control the high-frequency input switch and the low-frequency input switch for each of the induction heating apparatuses and to control the first power source output switch and the second power source output switch so as to connect at least one of the induction heating apparatuses to at least one of the first power source and the second power source, wherein each of the induction heating apparatuses further comprises a heater controller configured to send a switching request signal to the switching controller to turn on one of the first power source output switch and the second power source output switch, to turn off the other of the first power source output switch and the second power source output switch, and to switch on or off each of the high-frequency input switch and the low-frequency input switch.