A controlling method of an electronic device for receiving and reproducing contents, the method comprising: while receiving, from an external device through a main frequency band (110-1, 210-1), a signal including original data of contents, receiving, from the external device through at least one sub frequency band (110-2, 210-2; 110-n, 210-n), a connection state signal including information on the original data and time information according to the original data; identifying a reception state of the received original data based on the information included in the connection state signal; transmitting, to the external device through the main frequency band (110-1, 210-1) and the at least one sub frequency band (110-2, 210-2; 110-n, 210-n), a response signal including information on the identified reception state of the original data; receiving, from the external device and based on the response signal, at least one of a signal including first quality data of the contents through the main frequency band (110-1, 210-1) and a signal including second quality data of the contents through the at least one sub frequency band (110-2, 210-2; 110-n, 210-n), the first quality data being a higher quality than the second quality data and being different from quality of the original data; and wherein one of the signal including the first quality data of the contents or the signal including the second quality data of the contents to be received from the external device is determined based on the response signal, wherein a bandwidth corresponding to the main frequency band (110-1, 210-1) is relatively wider than a bandwidth corresponding to the at least one sub frequency band (110-2, 210-2; 110-n, 210-n), wherein the transmitting comprises: based on determining that the received original data is not missing by comparing the received original data and the connection state signal, transmitting, to the external device through the main frequency band (110-1, 210-1) and the at least one sub frequency band (110-2, 210-2; 110-n, 210-n), a first response signal to notify that the original data is received; based on determining that at least some of the original data is missing, transmitting, to the external device through the main frequency band (110-1, 210-1) and the at least one sub frequency band (110-2, 210-2; 110-n, 210-n), a second response signal including information on a missing part of the original data. while receiving, from an external device through a main frequency band (110-1, 210-1), a signal including original data of contents, receiving, from the external device through at least one sub frequency band (110-2, 210-2; 110-n, 210-n), a connection state signal including information on the original data and time information according to the original data; identifying a reception state of the received original data based on the information included in the connection state signal; transmitting, to the external device through the main frequency band (110-1, 210-1) and the at least one sub frequency band (110-2, 210-2; 110-n, 210-n), a response signal including information on the identified reception state of the original data; receiving, from the external device and based on the response signal, at least one of a signal including first quality data of the contents through the main frequency band (110-1, 210-1) and a signal including second quality data of the contents through the at least one sub frequency band (110-2, 210-2; 110-n, 210-n), the first quality data being a higher quality than the second quality data and being different from quality of the original data; and wherein one of the signal including the first quality data of the contents or the signal including the second quality data of the contents to be received from the external device is determined based on the response signal, wherein a bandwidth corresponding to the main frequency band (110-1, 210-1) is relatively wider than a bandwidth corresponding to the at least one sub frequency band (110-2, 210-2; 110-n, 210-n), wherein the transmitting comprises: based on determining that the received original data is not missing by comparing the received original data and the connection state signal, transmitting, to the external device through the main frequency band (110-1, 210-1) and the at least one sub frequency band (110-2, 210-2; 110-n, 210-n), a first response signal to notify that the original data is received; based on determining that at least some of the original data is missing, transmitting, to the external device through the main frequency band (110-1, 210-1) and the at least one sub frequency band (110-2, 210-2; 110-n, 210-n), a second response signal including information on a missing part of the original data. based on determining that the received original data is not missing by comparing the received original data and the connection state signal, transmitting, to the external device through the main frequency band (110-1, 210-1) and the at least one sub frequency band (110-2, 210-2; 110-n, 210-n), a first response signal to notify that the original data is received; based on determining that at least some of the original data is missing, transmitting, to the external device through the main frequency band (110-1, 210-1) and the at least one sub frequency band (110-2, 210-2; 110-n, 210-n), a second response signal including information on a missing part of the original data.