Abstract: In a purchase promotion server system, electronic goods/services information indicating goods/services scheduled to be purchased or goods/services desired to be purchased is stored for each user, a user state of a user regarding whether the user is fit to purchasing of goods/services is judged according to state data including a location information of the user, and a message urging/reminding the user to purchase the goods/services scheduled to be purchased or the goods/services desired to be purchased indicated by the electronic goods/services information is sent to the user via a network according to the user state of the user.

Abstract: An information processing method of executing an information process to solve a provided preposition by at least one information processing apparatus having a resource comprises preparing a plurality of plans to solve the preposition, each of the plans including at least one process step, selecting one executable plan among the plans according to the resource of the information processing apparatus, and executing the process step included in the selected plan.

Abstract: In a negotiation performed among a plurality of inferring units that are mutually connected through a network, at any time of which a consistent inferred state is obtained, the inferred state is accepted by the units as a settled inferred state. Since each inferring unit can perform an inference based on the settled inferred state, the inference can be effectively performed. Particularly, when a negotiation is hierarchically performed (hierarchical negotiation) or when a plurality of negotiations are performed in parallel (multi-negotiation), each negotiation can be consistently effected. In addition, in a negotiating process, each inferring unit negotiates with other inferring units using negotiation strategies having a standpoint of priority (role) and tolerance (transaction) of a request in the negotiation. In addition, each inferring unit autonomously changes the negotiation strategies for use corresponding to the negotiation history, the current internal state, and the current external state.