The safety area arrangement (10) according to the invention comprises means for determining the geographical location of a safety area customer (2A, 2B, 2C, 3A) in the customer's wireless data processing device. The safety area arrangement also comprises a safety area server (5), where the location, time, safety area and danger zone information of the safety area arrangement customers (2A, 2B, 2C, 3A, 4) is stored in real-time. When a safety area arrangement customer (2A, 2B, 2C, 3A) activates the safety area service program in his data processing device, the safety area server (5) sends to the customer (3A), based on the customer's positioning result, the positioning data of those second safety area arrangement customers (2A, 2B, 2C, 4), who are in the customer's (3A) safety area. These second customers' positioning data can be presented on a display of the safety area service customer's data processing device. If the customer (3A) is in a danger zone determined for some second customer (2A, 2B, 2C, 4), then the customer's (3A) data processing device generates an alarm detectable with human senses.
