An information setting method for a setting device, comprising: obtaining identification information from a wireless device to be caused to join a wireless network managed by a management device, the identification information being information that identifies the wireless device, and the identification information being stored in the wireless device; obtaining a first certificate from the wireless device, the first certificate certifying that the wireless device is a formal wireless device, the first certificate including a first public key and the first certificate being stored in the wireless device; obtaining a second certificate from the management device, the second certificate certifying that the management device is a formal management device, and the second certificate including a second public key; encoding, using the first public key, apparatus information required for the wireless device to join the wireless network, wherein the encoding of the apparatus information comprises: obtaining encoding instruction information that specifies a part of the apparatus information to be encoded; and encoding the part of the apparatus information; outputting the encoded apparatus information to the wireless device; outputting the remaining uncoded apparatus information to the wireless device; encoding, using the second public key, management information including the apparatus information and the identification information associated with the apparatus information; and outputting the encoded management information to the management device. obtaining identification information from a wireless device to be caused to join a wireless network managed by a management device, the identification information being information that identifies the wireless device, and the identification information being stored in the wireless device; obtaining a first certificate from the wireless device, the first certificate certifying that the wireless device is a formal wireless device, the first certificate including a first public key and the first certificate being stored in the wireless device; obtaining a second certificate from the management device, the second certificate certifying that the management device is a formal management device, and the second certificate including a second public key; encoding, using the first public key, apparatus information required for the wireless device to join the wireless network, wherein the encoding of the apparatus information comprises: obtaining encoding instruction information that specifies a part of the apparatus information to be encoded; and encoding the part of the apparatus information; outputting the encoded apparatus information to the wireless device; outputting the remaining uncoded apparatus information to the wireless device; encoding, using the second public key, management information including the apparatus information and the identification information associated with the apparatus information; and outputting the encoded management information to the management device. obtaining encoding instruction information that specifies a part of the apparatus information to be encoded; and encoding the part of the apparatus information; outputting the encoded apparatus information to the wireless device; outputting the remaining uncoded apparatus information to the wireless device; encoding, using the second public key, management information including the apparatus information and the identification information associated with the apparatus information; and outputting the encoded management information to the management device.