Sony Corp's Executive Deputy President Kazuo Hirai will hold a news conference on Sunday on a massive security breach of its popular PlayStation Network, the Japanese electronics giant said.

Hirai will speak at 2:00 p.m. Japan time (1 a.m. EDT) about the breach, as well as the firm's information management system and the schedule to resume services, Sony said in a news release on Saturday.

The Japanese electronic giant warned this week that hackers had stolen names, addresses, and possibly credit card details from the 77 million user accounts of its video game online network in one of the largest Internet security break-ins ever.

The firm, which shut down the network on April 19, could face legal actions after it delayed disclosing the security breach information. Its shares fell nearly 5 percent in Tokyo on Thursday.

(Reporting by Yoko Kubota; Editing by Hugh Lawson)

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