An image display apparatus operating with an image transmission apparatus by wireless communication, the image display apparatus comprising: a storage; a communication interface; and an operation state processor configured to: control the storage to store viewing information on an image viewed by a user before image display apparatus is turned off, and in response to the image display apparatus being turned on, control the communication interface to transmit a first control signal for booting up the image transmission apparatus to the image transmission apparatus; characterised in that: the operation state processor is configured to: identify whether the viewing information comprises information that an image was provided from the image transmission apparatus, based on identifying the viewing information comprising the information that an image was provided from the image transmission apparatus, control the communication interface to transmit a request for a network connection to the image transmission apparatus to use an image service provided by the image transmission apparatus, and based on identifying the viewing information not comprising information that an image was provided from the image transmission apparatus, control the communication interface to transmit a second control signal for changing a state of the booted image transmission apparatus to a power saving state to the image transmission apparatus. a storage; a communication interface; and an operation state processor configured to: control the storage to store viewing information on an image viewed by a user before image display apparatus is turned off, and in response to the image display apparatus being turned on, control the communication interface to transmit a first control signal for booting up the image transmission apparatus to the image transmission apparatus; characterised in that: the operation state processor is configured to: identify whether the viewing information comprises information that an image was provided from the image transmission apparatus, based on identifying the viewing information comprising the information that an image was provided from the image transmission apparatus, control the communication interface to transmit a request for a network connection to the image transmission apparatus to use an image service provided by the image transmission apparatus, and based on identifying the viewing information not comprising information that an image was provided from the image transmission apparatus, control the communication interface to transmit a second control signal for changing a state of the booted image transmission apparatus to a power saving state to the image transmission apparatus. control the storage to store viewing information on an image viewed by a user before image display apparatus is turned off, and in response to the image display apparatus being turned on, control the communication interface to transmit a first control signal for booting up the image transmission apparatus to the image transmission apparatus; characterised in that: the operation state processor is configured to: identify whether the viewing information comprises information that an image was provided from the image transmission apparatus, based on identifying the viewing information comprising the information that an image was provided from the image transmission apparatus, control the communication interface to transmit a request for a network connection to the image transmission apparatus to use an image service provided by the image transmission apparatus, and based on identifying the viewing information not comprising information that an image was provided from the image transmission apparatus, control the communication interface to transmit a second control signal for changing a state of the booted image transmission apparatus to a power saving state to the image transmission apparatus. identify whether the viewing information comprises information that an image was provided from the image transmission apparatus, based on identifying the viewing information comprising the information that an image was provided from the image transmission apparatus, control the communication interface to transmit a request for a network connection to the image transmission apparatus to use an image service provided by the image transmission apparatus, and based on identifying the viewing information not comprising information that an image was provided from the image transmission apparatus, control the communication interface to transmit a second control signal for changing a state of the booted image transmission apparatus to a power saving state to the image transmission apparatus.