To relieve a load on a user in the case of setting function data of an old mobile phone into a new mobile phone accompanied by a model revision.

A setting side mobile phone 1A to set function data to a mobile phone 1B to be set transfers its own function data set to a storage section 16 to the mobile phone 1B, the mobile phone 1B receives the transferred function data and sets the data to its own storage section 16, the mobile phone 1B reads the setting data from the storage section 16 and returns the data to the mobile phone 1A. When the return data and the function data of its own storage section 16 of the mobile phone 1A agree with each other, the mobile phone 1A decides that the function data have been set normal to the mobile phone 1B and the mobile phone 1A erases the function data of its own storage section 16.