Abstract: A user terminal of a first user acquires a topic of a predetermined event occurring between the first user and a second user who is another user, detects a behavior, of the first user, on a web performed in relation to the topic, generates web behavior history information that is a history of the behavior, and transmits the web behavior history information of the first user. A server receives the web behavior history information of the first user, and transmits, to a user terminal of the second user, information indicating a degree of interest in the topic or the second user felt by the first user, the information being based on the web behavior history information of the first user.

Abstract: An information processing apparatus disclosed includes a controller configured to execute the processing of obtaining user identification information for identifying a user, obtaining property information indicating a property of the user on the basis of the user identification information, and determining an upper limit number on the basis of the property information. The upper limit number is the number of specific items that the user is allowed to purchase.