PROBLEM TO BE SOLVED: To enable a company adopting a BtoB type unlimited reading service in a BtoB type unlimited reading service system to obtain a benefit leading to sales of its own products. An all-you-can-read service system 1 is a system suitable for a BtoB-type all-you-can-read service, and is composed of at least a BtoB platform 2 including a portal server 3 and a storage server 4, and a user authentication server 5. The portal server 3 stores the description range of the electronic book corresponding to the electronic book ID and the word indicating the content described in this description range for each electronic book ID, and the electronic book shown in the browsing log and this browsing range. A log aggregation unit 35 is provided which outputs a tag cloud including words in the description range corresponding to the above as a log aggregation result for each user name. [Selection diagram] Fig. 1
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