An object of the present invention is to realize an in-home network system that is capable of smoothly controlling an appliance even when a new kind of appliance that has not been obtained conventionally is connected to an in-home network or even when an unusual, special use form is set in a network. A sectional area of the beam end portion viewed from a side is larger than the beam main body portion. The invention also relates to the combination of such a container assembly and a reservoir assembly which is especially adapted for securely receiving the container assembly. For instance, each of the two or more servers may be adapted to provide mail service via simple mail transfer protocol and web service via hyper text transfer protocol.