a plurality of provision systems that provide data, and

a platform system that controls access to the data;

wherein the platform system:

receives, from a first user, an acquisition request including a data acquisition condition for specifying data to be acquired, a quality condition related to quality of data, and a provider condition related to providers of data provided by the plurality of provision systems,

performs control such that the first user is allowed to access data satisfying the data acquisition condition in a case where the data satisfying the data acquisition condition satisfies the quality condition, and a provider of the data satisfying the data acquisition condition satisfies the provider condition,

manages user management information storing first management data for managing a characteristic of a user and controlling data access, data management information storing second management data for managing a characteristic of data provided by each of the plurality of provision systems, and provider management information storing third management data for managing a characteristic of a provider of each of the plurality of provision systems,

decides whether or not the quality condition is satisfied, on a basis of the second management data that is acquired from the data management information and is related to data satisfying the data acquisition condition, and

decides whether or not the provider condition is satisfied, based on the third management data that is acquired from the provider management information and is related to the provider who provides the data satisfying the data acquisition condition.