To provide a data communication method capable of data communication, which is to be charged to a user, by only giving instruction to the connector of a provider through the Internet by the user when the user performs data communication between a portable personal computer and a personal computer at home while he/she is out.

A personal computer 2 commands the connector 41 of the provide 4 to connect to a personal computer 1 through the Internet. The connector 41 calls the personal computer 1 through a telephone line 6. Then, the personal computer 1 judges whether the calling source of telephone is the connector 41 by identification information of the calling source provided by a telephone line company. When the calling source of telephone is the connector 41, the user waits without answering to the call and after the finish of the call, connection between with the connector 41 is established by calling to the connector 41. After then, data communication is performed between the personal computer 1 and the personal computer 2 through the Internet.