A rule management device includes: a display unit which displays a plurality of condition objects that respectively indicate a plurality of conditions on a screen; an input receiving unit which receives an input for grouping the plurality of condition objects on the screen; and a rule registration unit which performs processing, for each of the group, for, when the group includes the plurality of condition objects, generating a rule that links a predetermined conclusion to a first condition in which all the plurality of conditions that are identified by the plurality of condition objects are combined by ANDs and registering the rule, and, when the group includes only one of the condition objects, generating a rule that links a predetermined conclusion to one of the conditions that is identified by the one of the condition objects and registering the rule.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. A rule management device comprising: a display unit which displays a plurality of condition objects that respectively indicate a plurality of conditions on a screen; an input receiving unit which receives an input for grouping the plurality of condition objects on the screen; and a rule registration unit which performs processing, for each of the group, for, when the group includes the plurality of condition objects, generating a rule that links a predetermined conclusion to a first condition in which all the plurality of conditions that are identified by the plurality of condition objects are combined by ANDs and registering the rule, and, when the group includes only one of the condition objects, generating a rule that links a predetermined conclusion to one of the conditions that is identified by the one of the condition objects and registering the rule. 2. The rule management device according to claim 1, wherein the display unit displays one or a plurality of conclusion objects that indicate the predetermined conclusion on the screen; the input receiving unit receives an input for including one of the conclusion objects in each of the group; and the rule registration unit generates a rule that links the predetermined conclusion identified by the conclusion object included in each of the group to a condition included in each group, and registers the rule. 3. The rule management device according to claim 1, wherein the display unit displays a multi-condition contained object that groups a part of the plurality of condition objects on the screen; the input receiving unit can receive an input for including the multi-condition contained object in the group; the rule registration unit, when the group includes the multi-condition contained object, generates a second condition in which all the plurality of conditions that are identified by the plurality of condition objects grouped by the multi-condition contained object are combined by ORs, when the group includes another one of the condition objects, generates the first condition in which a condition that is identified by the other one of the condition objects and the second condition are combined by ANDs, and, when the group includes no other one of the condition objects, generates a rule that links the predetermined conclusion to the second condition. 4. The rule management device according to claim 1, wherein the input receiving unit receives an input for linking the objects mutually with a line on the screen; and the rule registration unit generates the rule by treating the plurality of objects that are mutually associated with the line as the objects included in one of the groups. 5. The rule management device according to claim 1, wherein the display unit displays a definition object that indicates a definition of a condition wording included in the conditions on the screen. 6. The rule management device according to claim 5, wherein the condition wording includes a first condition wording of which definition differs for each of the conditions; and the display unit displays the definition object that indicates a definition of the first condition wording and the condition object that indicates the condition which is a premise of the definition by relating them. 7. The rule management device according to claim 6, wherein the display unit links displays the definition object that indicates a definition of the first condition wording and the condition object that indicates the condition which is a premise of the definition by linking them with a line. 8. The rule management device according to claim 1, further comprising: a rule display unit which displays a plurality of condition objects that respectively indicate a plurality of conditions on a screen, and displays the condition objects that respectively indicate one or a plurality of conditions included in each rule with grouping based on the rule registered by the rule registration unit; and a selection receiving unit which receives one selection input among the plurality of condition objects displayed by the rule display unit, wherein the rule display unit, when the selection receiving unit receives a selection input of one of the condition objects, displays one or a plurality of groups that include the selected condition object in a manner of distinguishing it or them from other groups. 9. The rule management device according to claim 1, further comprising: a rule description generation and output unit which generates and outputs a description that indicates each rule based on the rule registered by the rule registration unit. 10. A computer readable medium embodying a program the program causing a rule management device to perform a method, the method comprising: displaying a plurality of condition objects that respectively indicate a plurality of conditions on a screen; receiving an input for grouping the plurality of condition objects on the screen; and performing processing, for each of the group, for, when the group includes the plurality of condition objects, generating a rule that links a predetermined conclusion to a first condition in which all the plurality of conditions that are identified by the plurality of condition objects are combined by ANDs and registering the rule, and, when the group includes only one of the condition objects, generating a rule that links a predetermined conclusion to one of the conditions that is identified by the one of the condition objects and registering the rule. 11. A rule management method for a rule management device comprising: displaying a plurality of condition objects that respectively indicate a plurality of conditions on a screen; receiving an input for grouping the plurality of condition objects on the screen; and performing processing, for each of the group, for, when the group includes the plurality of condition objects, generating a rule that links a predetermined conclusion to a first condition in which all the plurality of conditions that are identified by the plurality of condition objects are combined by ANDs and registering the rule, and, when the group includes only one of the condition objects, generating a rule that links a predetermined conclusion to one of the conditions that is identified by the one of the condition objects and registering the rule. 12. A rule management device comprising: display means for displaying a plurality of condition objects that respectively indicate a plurality of conditions on a screen; input receiving means for receiving an input for grouping the plurality of condition objects on the screen; and rule registration means for performing processing, for each of the group, for, when the group includes the plurality of condition objects, generating a rule that links a predetermined conclusion to a first condition in which all the plurality of conditions that are identified by the plurality of condition objects are combined by ANDs and registering the rule, and, when the group includes only one of the condition objects, generating a rule that links a predetermined conclusion to one of the conditions that is identified by the one of the condition objects and registering the rule.