An x-ray imaging apparatus comprising: a display; an input device; a wireless communication interface (160, 161, 260, 261) configured to communicate with an x-ray detector; and a controller configured to: control the display to display the size of the x-ray detector, that has been selected by a user; control the display to display a first icon (G330a, G610) indicating a first mounting portion (300, 310, 320, 330) on which the selected x-ray detector is presently mounted in a deep color, and a second icon (G320, G630) indicating a second mounting portion (300, 310, 320, 330) having also a size to mount the selected x-ray detector; receive, via the input device (200, 211), a user selection of one of the first icon and the second icon that are displayed; and control the display to distinguish the icon (G330a, G610) that has been selected by the user, from the other icon (G320, G630) that is displayed, by displaying the selected icon (G330a, G610) in a deep color and the other icon (G320, G630) in an original color, wherein the first icon and the second icon each display a wireless setting icon to display whether wireless communication is being performed through the wireless communication interface, and wherein set information, being information about the mounting portion indicated by the selected icon (G610, G630), is transferred through the wireless communication interface to the x-ray detector. a display; an input device; a wireless communication interface (160, 161, 260, 261) configured to communicate with an x-ray detector; and a controller configured to: control the display to display the size of the x-ray detector, that has been selected by a user; control the display to display a first icon (G330a, G610) indicating a first mounting portion (300, 310, 320, 330) on which the selected x-ray detector is presently mounted in a deep color, and a second icon (G320, G630) indicating a second mounting portion (300, 310, 320, 330) having also a size to mount the selected x-ray detector; receive, via the input device (200, 211), a user selection of one of the first icon and the second icon that are displayed; and control the display to distinguish the icon (G330a, G610) that has been selected by the user, from the other icon (G320, G630) that is displayed, by displaying the selected icon (G330a, G610) in a deep color and the other icon (G320, G630) in an original color, control the display to display the size of the x-ray detector, that has been selected by a user; control the display to display a first icon (G330a, G610) indicating a first mounting portion (300, 310, 320, 330) on which the selected x-ray detector is presently mounted in a deep color, and a second icon (G320, G630) indicating a second mounting portion (300, 310, 320, 330) having also a size to mount the selected x-ray detector; receive, via the input device (200, 211), a user selection of one of the first icon and the second icon that are displayed; and control the display to distinguish the icon (G330a, G610) that has been selected by the user, from the other icon (G320, G630) that is displayed, by displaying the selected icon (G330a, G610) in a deep color and the other icon (G320, G630) in an original color, wherein the first icon and the second icon each display a wireless setting icon to display whether wireless communication is being performed through the wireless communication interface, and wherein set information, being information about the mounting portion indicated by the selected icon (G610, G630), is transferred through the wireless communication interface to the x-ray detector.