To provide a calling card in which information required by a third party can be transmitted when required, and which can be easily managed.

The electronic calling card device has the following functions (1)-(6) in a mobile phone unit. (1) The electronic calling card of its own is prepared and registered. (2) The electronic calling card of its own is transmitted to a mobile phone of the third party. (3) The electronic calling card of the third party is received from the mobile phone of the third party and registered. (4) The registered calling card of its own is updated. The updated information is transmitted to the mobile phone of the third party of the registered electronic calling card of the third party. (5) The update information of the registered electronic calling card of the third party is received. The electronic calling card is updated in accordance with the update information. (6) A communication history such as electronic mails from the third party and incoming calls of a telephone is browsed and managed on the registered electronic calling card of the third party.