PROGRAM EXECUTION SYSTEM THROUGH COMMUNICATION LINE

PROBLEM TO BE SOLVED: To obtain and execute the optimum program adjusted to the state of a communication line in a network system using the communication line. SOLUTION: A management program 30, a communication state decision program 31 and a communication state or the like monitoring program 32 are prepared for a server 10. A client 11 first obtains the programs 30 and 31. The program 30 decides whether only an execution program main part 33 is obtained or both the part 33 and an execution program expanding part 34 are obtained on the basis of the decided results of the program 31. In the case of obtaining the part 33 alone, the program 32 is successively obtained. The program 10 decides whether the part 34 is obtained or not on the basis of the results of monitoring performed by the program 32 in parallel to program execution.