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In the process of communication's change, there was transformation of the way to treat information. Although management of information by only one computer in house has started, many people want more comfortable life and they have computers in their home, their office and in their hands.

But management of information becomes difficult by increase of terminal. Then "Cloud computing" appearance.

Cloud computing is the system to make network and treat data and service via Internet.

All users and company have managed data in individual. But this system is different in the past. Users have companies deal with management of data via Internet and pay the companies charge. Users only have to prepare computer and connect Internet, though we had to prepare medium which can be recorded much data.

Cloud computing is classified in three types.The first type is SaaS. This means donation of software's package via Internet. The famous example is E-mail, gloupware, and so on, which move on Internet browser.

The second type is PaaS. This is platform to execute application via Internet. It is attracted as the service that users can invest application soft made by themselves.

The third type is HaaS. This is the service which becoming most mainstream. Donation of data server, virtual hardware, and so on, falls into this service.

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