Cordless telephone equipment comprising: at least one handset; and a base unit of the handset, wherein the base unit is configured to be connected to a wireless IP-terminal via a wireless LAN, the wireless IP-terminal configured for instructing the base unit to transfer handset transfer-data including image data or music data to the handset, wherein the base unit comprises: a wireless LAN interface section that is configured to transmit and to receive packet data to and from the wireless IP terminal; a handset transfer-data reception section that is configured to receive handset transfer-data including transfer-destination handset information from the wireless IP-terminal via the wireless LAN interface section and to store the handset transfer-data in a storage section, the transfer-destination handset information indicating a transfer-destination handset number; a transfer-destination handset determination section that is configured to determine a transfer-destination handset of the handset transfer-data based on the transfer -destination handset information of the handset transfer-data stored in the storage section; a handset transfer-data conversion section that is configured to convert the handset transfer-data into a data format usable in the transfer-destination handset according to a data type of the handset transfer-data; and a handset transfer-data transmission section that is configured to transmit the handset transfer-data that has been subjected to the conversion, to all transfer-destination handsets extracted by the transfer-destination handset determination section. at least one handset; and a base unit of the handset, wherein the base unit is configured to be connected to a wireless IP-terminal via a wireless LAN, the wireless IP-terminal configured for instructing the base unit to transfer handset transfer-data including image data or music data to the handset, wherein the base unit comprises: a wireless LAN interface section that is configured to transmit and to receive packet data to and from the wireless IP terminal; a handset transfer-data reception section that is configured to receive handset transfer-data including transfer-destination handset information from the wireless IP-terminal via the wireless LAN interface section and to store the handset transfer-data in a storage section, the transfer-destination handset information indicating a transfer-destination handset number; a transfer-destination handset determination section that is configured to determine a transfer-destination handset of the handset transfer-data based on the transfer -destination handset information of the handset transfer-data stored in the storage section; a handset transfer-data conversion section that is configured to convert the handset transfer-data into a data format usable in the transfer-destination handset according to a data type of the handset transfer-data; and a handset transfer-data transmission section that is configured to transmit the handset transfer-data that has been subjected to the conversion, to all transfer-destination handsets extracted by the transfer-destination handset determination section. a wireless LAN interface section that is configured to transmit and to receive packet data to and from the wireless IP terminal; a handset transfer-data reception section that is configured to receive handset transfer-data including transfer-destination handset information from the wireless IP-terminal via the wireless LAN interface section and to store the handset transfer-data in a storage section, the transfer-destination handset information indicating a transfer-destination handset number; a transfer-destination handset determination section that is configured to determine a transfer-destination handset of the handset transfer-data based on the transfer -destination handset information of the handset transfer-data stored in the storage section; a handset transfer-data conversion section that is configured to convert the handset transfer-data into a data format usable in the transfer-destination handset according to a data type of the handset transfer-data; and a handset transfer-data transmission section that is configured to transmit the handset transfer-data that has been subjected to the conversion, to all transfer-destination handsets extracted by the transfer-destination handset determination section.